718942721 has 16 divisors (see below), whose sum is σ = 842552064. Its totient is φ = 600709824.

The previous prime is 718942711. The next prime is 718942727. The reversal of 718942721 is 127249817.

It is a cyclic number.

It is not a de Polignac number, because 718942721 - 2²⁶ = 651833857 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (718942727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52076 + ... + 64418.

It is an arithmetic number, because the mean of its divisors is an integer number (52659504).

Almost surely, 2^718942721 is an apocalyptic number.

It is an amenable number.

718942721 is a deficient number, since it is larger than the sum of its proper divisors (123609343).

718942721 is a wasteful number, since it uses less digits than its factorization.

718942721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12560.

The product of its digits is 56448, while the sum is 41.

The square root of 718942721 is about 26813.1072611885. The cubic root of 718942721 is about 895.8420218827.

The spelling of 718942721 in words is "seven hundred eighteen million, nine hundred forty-two thousand, seven hundred twenty-one".