31394399 has 2 divisors, whose sum is σ = 31394400. Its totient is φ = 31394398.

The previous prime is 31394387. The next prime is 31394417. The reversal of 31394399 is 99349313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31394399 - 2²⁰ = 30345823 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31394309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15697199 + 15697200.

It is an arithmetic number, because the mean of its divisors is an integer number (15697200).

Almost surely, 2^31394399 is an apocalyptic number.

31394399 is a deficient number, since it is larger than the sum of its proper divisors (1).

31394399 is an equidigital number, since it uses as much as digits as its factorization.

31394399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78732, while the sum is 41.

The square root of 31394399 is about 5603.0704975040. The cubic root of 31394399 is about 315.4646673697.

The spelling of 31394399 in words is "thirty-one million, three hundred ninety-four thousand, three hundred ninety-nine".