3940857 has 12 divisors (see below), whose sum is σ = 5730660. Its totient is φ = 2609568.

The previous prime is 3940841. The next prime is 3940891. The reversal of 3940857 is 7580493.

It can be written as a sum of positive squares in 2 ways, for example, as 1806336 + 2134521 = 1344^2 + 1461^2 .

It is not a de Polignac number, because 3940857 - 2⁴ = 3940841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3940837) 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, 19 + ... + 2807.

It is an arithmetic number, because the mean of its divisors is an integer number (477555).

Almost surely, 2^3940857 is an apocalyptic number.

It is an amenable number.

3940857 is a deficient number, since it is larger than the sum of its proper divisors (1789803).

3940857 is a wasteful number, since it uses less digits than its factorization.

3940857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2952 (or 2949 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 3940857 is about 1985.1591875716. The cubic root of 3940857 is about 157.9538534251.

The spelling of 3940857 in words is "three million, nine hundred forty thousand, eight hundred fifty-seven".