3917731 has 2 divisors, whose sum is σ = 3917732. Its totient is φ = 3917730.

The previous prime is 3917729. The next prime is 3917737. The reversal of 3917731 is 1377193.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3917731 - 2¹ = 3917729 is a prime.

It is a super-2 number, since 2×3917731² = 30697232376722, which contains 22 as substring.

Together with 3917729, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 3917693 and 3917702.

It is not a weakly prime, because it can be changed into another prime (3917737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1958865 + 1958866.

It is an arithmetic number, because the mean of its divisors is an integer number (1958866).

Almost surely, 2^3917731 is an apocalyptic number.

3917731 is a deficient number, since it is larger than the sum of its proper divisors (1).

3917731 is an equidigital number, since it uses as much as digits as its factorization.

3917731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3969, while the sum is 31.

The square root of 3917731 is about 1979.3258953492. The cubic root of 3917731 is about 157.6442752900.

The spelling of 3917731 in words is "three million, nine hundred seventeen thousand, seven hundred thirty-one".