72403018 has 4 divisors (see below), whose sum is σ = 108604530. Its totient is φ = 36201508.

The previous prime is 72402991. The next prime is 72403027. The reversal of 72403018 is 81030427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81030427 = 2141 ⋅37847.

It can be written as a sum of positive squares in only one way, i.e., 65658609 + 6744409 = 8103^2 + 2597^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72402983 and 72403001.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18100753 + ... + 18100756.

Almost surely, 2^72403018 is an apocalyptic number.

72403018 is a deficient number, since it is larger than the sum of its proper divisors (36201512).

72403018 is a wasteful number, since it uses less digits than its factorization.

72403018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36201511.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 72403018 is about 8508.9962980366. The cubic root of 72403018 is about 416.7915349131.

The spelling of 72403018 in words is "seventy-two million, four hundred three thousand, eighteen".