3891657 has 32 divisors (see below), whose sum is σ = 6856704. Its totient is φ = 1900800.

The previous prime is 3891593. The next prime is 3891659. The reversal of 3891657 is 7561983.

It is not a de Polignac number, because 3891657 - 2⁶ = 3891593 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891659) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3432 + ... + 4422.

It is an arithmetic number, because the mean of its divisors is an integer number (214272).

Almost surely, 2^3891657 is an apocalyptic number.

It is an amenable number.

3891657 is a deficient number, since it is larger than the sum of its proper divisors (2965047).

3891657 is a wasteful number, since it uses less digits than its factorization.

3891657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029.

The product of its digits is 45360, while the sum is 39.

The square root of 3891657 is about 1972.7283137827. The cubic root of 3891657 is about 157.2937688787.

The spelling of 3891657 in words is "three million, eight hundred ninety-one thousand, six hundred fifty-seven".