3921957 has 12 divisors (see below), whose sum is σ = 6101004. Its totient is φ = 2413440.

The previous prime is 3921949. The next prime is 3921959. The reversal of 3921957 is 7591293.

It can be written as a sum of positive squares in 2 ways, for example, as 820836 + 3101121 = 906^2 + 1761^2 .

It is not a de Polignac number, because 3921957 - 2³ = 3921949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16644 + ... + 16877.

It is an arithmetic number, because the mean of its divisors is an integer number (508417).

Almost surely, 2^3921957 is an apocalyptic number.

It is an amenable number.

3921957 is a deficient number, since it is larger than the sum of its proper divisors (2179047).

3921957 is a wasteful number, since it uses less digits than its factorization.

3921957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33540 (or 33537 counting only the distinct ones).

The product of its digits is 17010, while the sum is 36.

The square root of 3921957 is about 1980.3931427876. The cubic root of 3921957 is about 157.7009377909.

The spelling of 3921957 in words is "three million, nine hundred twenty-one thousand, nine hundred fifty-seven".