723942391 has 2 divisors, whose sum is σ = 723942392. Its totient is φ = 723942390.

The previous prime is 723942377. The next prime is 723942413. The reversal of 723942391 is 193249327.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 723942391 - 2²⁵ = 690387959 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 (723942301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361971195 + 361971196.

It is an arithmetic number, because the mean of its divisors is an integer number (361971196).

Almost surely, 2^723942391 is an apocalyptic number.

723942391 is a deficient number, since it is larger than the sum of its proper divisors (1).

723942391 is an equidigital number, since it uses as much as digits as its factorization.

723942391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 40.

The square root of 723942391 is about 26906.1775620395. The cubic root of 723942391 is about 897.9138475690.

The spelling of 723942391 in words is "seven hundred twenty-three million, nine hundred forty-two thousand, three hundred ninety-one".