718172421 has 8 divisors (see below), whose sum is σ = 958505184. Its totient is φ = 478310640.

The previous prime is 718172407. The next prime is 718172423. The reversal of 718172421 is 124271817.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 718172421 - 2¹⁰ = 718171397 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718172423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114171 + ... + 120296.

It is an arithmetic number, because the mean of its divisors is an integer number (119813148).

Almost surely, 2^718172421 is an apocalyptic number.

It is an amenable number.

718172421 is a deficient number, since it is larger than the sum of its proper divisors (240332763).

718172421 is a wasteful number, since it uses less digits than its factorization.

718172421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235491.

The product of its digits is 6272, while the sum is 33.

The square root of 718172421 is about 26798.7391681027. The cubic root of 718172421 is about 895.5219622127.

The spelling of 718172421 in words is "seven hundred eighteen million, one hundred seventy-two thousand, four hundred twenty-one".