715637421 has 24 divisors (see below), whose sum is σ = 1053861120. Its totient is φ = 467834400.

The previous prime is 715637407. The next prime is 715637431. The reversal of 715637421 is 124736517.

It is a happy number.

715637421 is a `hidden beast` number, since 7 + 1 + 563 + 74 + 21 = 666.

It is not a de Polignac number, because 715637421 - 2¹¹ = 715635373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (715637401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 195276 + ... + 198906.

It is an arithmetic number, because the mean of its divisors is an integer number (43910880).

Almost surely, 2^715637421 is an apocalyptic number.

It is an amenable number.

715637421 is a deficient number, since it is larger than the sum of its proper divisors (338223699).

715637421 is a wasteful number, since it uses less digits than its factorization.

715637421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4057 (or 4054 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 715637421 is about 26751.4003558692. The cubic root of 715637421 is about 894.4670509736.

The spelling of 715637421 in words is "seven hundred fifteen million, six hundred thirty-seven thousand, four hundred twenty-one".