31868407 has 2 divisors, whose sum is σ = 31868408. Its totient is φ = 31868406.

The previous prime is 31868401. The next prime is 31868411. The reversal of 31868407 is 70486813.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31868407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31868401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15934203 + 15934204.

It is an arithmetic number, because the mean of its divisors is an integer number (15934204).

Almost surely, 2^31868407 is an apocalyptic number.

31868407 is a deficient number, since it is larger than the sum of its proper divisors (1).

31868407 is an equidigital number, since it uses as much as digits as its factorization.

31868407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 31868407 is about 5645.2109792283. The cubic root of 31868407 is about 317.0444231813.

The spelling of 31868407 in words is "thirty-one million, eight hundred sixty-eight thousand, four hundred seven".