72392405 has 4 divisors (see below), whose sum is σ = 86870892. Its totient is φ = 57913920.

The previous prime is 72392399. The next prime is 72392423. The reversal of 72392405 is 50429327.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12453841 + 59938564 = 3529^2 + 7742^2 .

It is not a de Polignac number, because 72392405 - 2²⁰ = 71343829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7239236 + ... + 7239245.

It is an arithmetic number, because the mean of its divisors is an integer number (21717723).

Almost surely, 2^72392405 is an apocalyptic number.

It is an amenable number.

72392405 is a deficient number, since it is larger than the sum of its proper divisors (14478487).

72392405 is a wasteful number, since it uses less digits than its factorization.

72392405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14478486.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 72392405 is about 8508.3726411106. The cubic root of 72392405 is about 416.7711691657.

The spelling of 72392405 in words is "seventy-two million, three hundred ninety-two thousand, four hundred five".