72399292 has 24 divisors (see below), whose sum is σ = 145412960. Its totient is φ = 30896640.

The previous prime is 72399287. The next prime is 72399293. The reversal of 72399292 is 29299327.

It is a happy number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72399293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1384 + ... + 12112.

Almost surely, 2^72399292 is an apocalyptic number.

It is an amenable number.

72399292 is an abundant number, since it is smaller than the sum of its proper divisors (73013668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72399292 is a wasteful number, since it uses less digits than its factorization.

72399292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10981 (or 10979 counting only the distinct ones).

The product of its digits is 122472, while the sum is 43.

The square root of 72399292 is about 8508.7773504776. Note that the first 3 decimals coincide. The cubic root of 72399292 is about 416.7843851563.

The spelling of 72399292 in words is "seventy-two million, three hundred ninety-nine thousand, two hundred ninety-two".