722687939 has 2 divisors, whose sum is σ = 722687940. Its totient is φ = 722687938.

The previous prime is 722687887. The next prime is 722687981. The reversal of 722687939 is 939786227.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 722687939 - 2⁸ = 722687683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (722687039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361343969 + 361343970.

It is an arithmetic number, because the mean of its divisors is an integer number (361343970).

Almost surely, 2^722687939 is an apocalyptic number.

722687939 is a deficient number, since it is larger than the sum of its proper divisors (1).

722687939 is an equidigital number, since it uses as much as digits as its factorization.

722687939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 53.

The square root of 722687939 is about 26882.8558564748. The cubic root of 722687939 is about 897.3949107640.

The spelling of 722687939 in words is "seven hundred twenty-two million, six hundred eighty-seven thousand, nine hundred thirty-nine".