3945731 has 2 divisors, whose sum is σ = 3945732. Its totient is φ = 3945730.

The previous prime is 3945727. The next prime is 3945757. The reversal of 3945731 is 1375493.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3945731 - 2² = 3945727 is a prime.

It is a super-2 number, since 2×3945731² = 31137586248722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3945701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972865 + 1972866.

It is an arithmetic number, because the mean of its divisors is an integer number (1972866).

Almost surely, 2^3945731 is an apocalyptic number.

3945731 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945731 is an equidigital number, since it uses as much as digits as its factorization.

3945731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 32.

The square root of 3945731 is about 1986.3864175935. The cubic root of 3945731 is about 158.0189450124.

The spelling of 3945731 in words is "three million, nine hundred forty-five thousand, seven hundred thirty-one".