721412399 has 2 divisors, whose sum is σ = 721412400. Its totient is φ = 721412398.

The previous prime is 721412339. The next prime is 721412401. The reversal of 721412399 is 993214127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721412399 - 2¹⁶ = 721346863 is a prime.

Together with 721412401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721412339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360706199 + 360706200.

It is an arithmetic number, because the mean of its divisors is an integer number (360706200).

Almost surely, 2^721412399 is an apocalyptic number.

721412399 is a deficient number, since it is larger than the sum of its proper divisors (1).

721412399 is an equidigital number, since it uses as much as digits as its factorization.

721412399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 721412399 is about 26859.1213370803. The cubic root of 721412399 is about 896.8666342448.

The spelling of 721412399 in words is "seven hundred twenty-one million, four hundred twelve thousand, three hundred ninety-nine".