724978399 has 2 divisors, whose sum is σ = 724978400. Its totient is φ = 724978398.

The previous prime is 724978367. The next prime is 724978417. The reversal of 724978399 is 993879427.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 724978399 - 2⁵ = 724978367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (724978099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362489199 + 362489200.

It is an arithmetic number, because the mean of its divisors is an integer number (362489200).

Almost surely, 2^724978399 is an apocalyptic number.

724978399 is a deficient number, since it is larger than the sum of its proper divisors (1).

724978399 is an equidigital number, since it uses as much as digits as its factorization.

724978399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 58.

The square root of 724978399 is about 26925.4229121847. The cubic root of 724978399 is about 898.3419675162.

The spelling of 724978399 in words is "seven hundred twenty-four million, nine hundred seventy-eight thousand, three hundred ninety-nine".