72394921 has 8 divisors (see below), whose sum is σ = 76608000. Its totient is φ = 68222160.

The previous prime is 72394913. The next prime is 72394969. The reversal of 72394921 is 12949327.

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

It is not a de Polignac number, because 72394921 - 2³ = 72394913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72094921) 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, 6346 + ... + 13603.

It is an arithmetic number, because the mean of its divisors is an integer number (9576000).

Almost surely, 2^72394921 is an apocalyptic number.

It is an amenable number.

72394921 is a deficient number, since it is larger than the sum of its proper divisors (4213079).

72394921 is a wasteful number, since it uses less digits than its factorization.

72394921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20159.

The product of its digits is 27216, while the sum is 37.

The square root of 72394921 is about 8508.5204941870. The cubic root of 72394921 is about 416.7759974076.

The spelling of 72394921 in words is "seventy-two million, three hundred ninety-four thousand, nine hundred twenty-one".