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3971971 = 14092819
BaseRepresentation
bin1111001001101110000011
321110210112001
433021232003
52004100341
6221044431
745522043
oct17115603
97423461
103971971
112273223
1213b6717
13a90ba3
14755723
15536d31
hex3c9b83

3971971 has 4 divisors (see below), whose sum is σ = 3976200. Its totient is φ = 3967744.

The previous prime is 3971963. The next prime is 3971977. The reversal of 3971971 is 1791793.

3971971 is a nontrivial binomial coefficient, being equal to C(2819, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 3971971 - 23 = 3971963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3971971.

It is not an unprimeable number, because it can be changed into a prime (3971977) 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 + ... + 2818.

It is an arithmetic number, because the mean of its divisors is an integer number (994050).

Almost surely, 23971971 is an apocalyptic number.

3971971 is the 2818-th triangular number.

3971971 is the 940-th centered nonagonal number.

3971971 is a deficient number, since it is larger than the sum of its proper divisors (4229).

3971971 is a wasteful number, since it uses less digits than its factorization.

3971971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4228.

The product of its digits is 11907, while the sum is 37.

The square root of 3971971 is about 1992.9804314142. The cubic root of 3971971 is about 158.3684585660.

It can be divided in two parts, 39 and 71971, that added together give a triangular number (72010 = T379).

The spelling of 3971971 in words is "three million, nine hundred seventy-one thousand, nine hundred seventy-one".

Divisors: 1 1409 2819 3971971