72018203 has 4 divisors (see below), whose sum is σ = 72327528. Its totient is φ = 71708880.

The previous prime is 72018197. The next prime is 72018229. The reversal of 72018203 is 30281027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30281027 = 7 ⋅4325861.

It is a cyclic number.

It is not a de Polignac number, because 72018203 - 2²⁰ = 70969627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72018283) 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 3 ways as a sum of consecutive naturals, for example, 154313 + ... + 154778.

It is an arithmetic number, because the mean of its divisors is an integer number (18081882).

Almost surely, 2^72018203 is an apocalyptic number.

72018203 is a deficient number, since it is larger than the sum of its proper divisors (309325).

72018203 is a wasteful number, since it uses less digits than its factorization.

72018203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309324.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 72018203 is about 8486.3539285137. The cubic root of 72018203 is about 416.0518206987.

The spelling of 72018203 in words is "seventy-two million, eighteen thousand, two hundred three".