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8026021 = 20034007
BaseRepresentation
bin11110100111011110100101
3120002202122001
4132213132211
54023313041
6444005301
7125135323
oct36473645
916082561
108026021
114592083
122830831
131880233
1410ccd13
15a88131
hex7a77a5

8026021 has 4 divisors (see below), whose sum is σ = 8032032. Its totient is φ = 8020012.

The previous prime is 8026013. The next prime is 8026027. The reversal of 8026021 is 1206208.

It is a happy number.

8026021 is a nontrivial binomial coefficient, being equal to C(4007, 2).

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 8026021 - 23 = 8026013 is a prime.

It is a Duffinian number.

8026021 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8026021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8026027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 4006.

It is an arithmetic number, because the mean of its divisors is an integer number (2008008).

Almost surely, 28026021 is an apocalyptic number.

8026021 is the 4006-th triangular number.

8026021 is the 1336-th centered nonagonal number.

It is an amenable number.

8026021 is a deficient number, since it is larger than the sum of its proper divisors (6011).

8026021 is a wasteful number, since it uses less digits than its factorization.

8026021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6010.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 8026021 is about 2833.0232967627. The cubic root of 8026021 is about 200.2166069890.

The spelling of 8026021 in words is "eight million, twenty-six thousand, twenty-one".

Divisors: 1 2003 4007 8026021