72434993 has 4 divisors (see below), whose sum is σ = 72506148. Its totient is φ = 72363840.

The previous prime is 72434983. The next prime is 72435001. The reversal of 72434993 is 39943427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39943427 = 79 ⋅505613.

It can be written as a sum of positive squares in 2 ways, for example, as 39337984 + 33097009 = 6272^2 + 5753^2 .

It is a cyclic number.

It is not a de Polignac number, because 72434993 - 2⁸ = 72434737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 72434993.

It is not an unprimeable number, because it can be changed into a prime (72434903) 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, 34028 + ... + 36093.

It is an arithmetic number, because the mean of its divisors is an integer number (18126537).

Almost surely, 2^72434993 is an apocalyptic number.

It is an amenable number.

72434993 is a deficient number, since it is larger than the sum of its proper divisors (71155).

72434993 is a wasteful number, since it uses less digits than its factorization.

72434993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71154.

The product of its digits is 163296, while the sum is 41.

The square root of 72434993 is about 8510.8749843950. The cubic root of 72434993 is about 416.8528811034.

The spelling of 72434993 in words is "seventy-two million, four hundred thirty-four thousand, nine hundred ninety-three".