3957731 has 4 divisors (see below), whose sum is σ = 3961752. Its totient is φ = 3953712.

The previous prime is 3957713. The next prime is 3957743. The reversal of 3957731 is 1377593.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1377593 = 7 ⋅196799.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3957731 is a prime.

It is a super-2 number, since 2×3957731² = 31327269336722, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 3957691 and 3957700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3957761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575 + ... + 2871.

It is an arithmetic number, because the mean of its divisors is an integer number (990438).

Almost surely, 2^3957731 is an apocalyptic number.

3957731 is a deficient number, since it is larger than the sum of its proper divisors (4021).

3957731 is a wasteful number, since it uses less digits than its factorization.

3957731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020.

The product of its digits is 19845, while the sum is 35.

The square root of 3957731 is about 1989.4046848241. The cubic root of 3957731 is about 158.1789752048.

The spelling of 3957731 in words is "three million, nine hundred fifty-seven thousand, seven hundred thirty-one".