72918401 has 4 divisors (see below), whose sum is σ = 73063872. Its totient is φ = 72772932.

The previous prime is 72918367. The next prime is 72918403. The reversal of 72918401 is 10481927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10481927 = 199 ⋅52673.

It is a cyclic number.

It is not a de Polignac number, because 72918401 - 2⁶ = 72918337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72918403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71981 + ... + 72986.

It is an arithmetic number, because the mean of its divisors is an integer number (18265968).

Almost surely, 2^72918401 is an apocalyptic number.

It is an amenable number.

72918401 is a deficient number, since it is larger than the sum of its proper divisors (145471).

72918401 is a wasteful number, since it uses less digits than its factorization.

72918401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145470.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 72918401 is about 8539.2271898574. The cubic root of 72918401 is about 417.7781401654.

The spelling of 72918401 in words is "seventy-two million, nine hundred eighteen thousand, four hundred one".