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7669381 = 19513931
BaseRepresentation
bin11101010000011010000101
3112102122102011
4131100122011
53430410011
6432214221
7122121466
oct35203205
915378364
107669381
114369135
12269a371
131786ac5
141038d6d
15a17621
hex750685

7669381 has 4 divisors (see below), whose sum is σ = 7675264. Its totient is φ = 7663500.

The previous prime is 7669367. The next prime is 7669393. The reversal of 7669381 is 1839667.

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 a cyclic number.

It is not a de Polignac number, because 7669381 - 211 = 7667333 is a prime.

It is a super-2 number, since 2×76693812 = 117638809846322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7669301) 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, 15 + ... + 3916.

It is an arithmetic number, because the mean of its divisors is an integer number (1918816).

Almost surely, 27669381 is an apocalyptic number.

7669381 is the 1752-nd centered pentagonal number.

It is an amenable number.

7669381 is a deficient number, since it is larger than the sum of its proper divisors (5883).

7669381 is a wasteful number, since it uses less digits than its factorization.

7669381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5882.

The product of its digits is 54432, while the sum is 40.

The square root of 7669381 is about 2769.3647285975. The cubic root of 7669381 is about 197.2059909967.

The spelling of 7669381 in words is "seven million, six hundred sixty-nine thousand, three hundred eighty-one".

Divisors: 1 1951 3931 7669381