716421993 has 12 divisors (see below), whose sum is σ = 1111185360. Its totient is φ = 409383912.

The previous prime is 716421971. The next prime is 716422019. The reversal of 716421993 is 399124617.

It is not a de Polignac number, because 716421993 - 2¹⁷ = 716290921 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (716421493) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2436663 + ... + 2436956.

It is an arithmetic number, because the mean of its divisors is an integer number (92598780).

Almost surely, 2^716421993 is an apocalyptic number.

It is an amenable number.

716421993 is a deficient number, since it is larger than the sum of its proper divisors (394763367).

716421993 is a wasteful number, since it uses less digits than its factorization.

716421993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4873636 (or 4873629 counting only the distinct ones).

The product of its digits is 81648, while the sum is 42.

The square root of 716421993 is about 26766.0604684365. The cubic root of 716421993 is about 894.7938074571.

The spelling of 716421993 in words is "seven hundred sixteen million, four hundred twenty-one thousand, nine hundred ninety-three".