72406399 has 8 divisors (see below), whose sum is σ = 78255632. Its totient is φ = 66597120.

The previous prime is 72406391. The next prime is 72406403. The reversal of 72406399 is 99360427.

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

It is a cyclic number.

It is not a de Polignac number, because 72406399 - 2³ = 72406391 is a prime.

It is a super-2 number, since 2×72406399² = 10485373232294402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72406391) 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, 6162 + ... + 13519.

It is an arithmetic number, because the mean of its divisors is an integer number (9781954).

Almost surely, 2^72406399 is an apocalyptic number.

72406399 is a deficient number, since it is larger than the sum of its proper divisors (5849233).

72406399 is a wasteful number, since it uses less digits than its factorization.

72406399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19977.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 72406399 is about 8509.1949677981. The cubic root of 72406399 is about 416.7980224430.

The spelling of 72406399 in words is "seventy-two million, four hundred six thousand, three hundred ninety-nine".