18038972293 has 4 divisors (see below), whose sum is σ = 18068400268. Its totient is φ = 18009544320.

The previous prime is 18038972249. The next prime is 18038972297. The reversal of 18038972293 is 39227983081.

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 483252289 + 17555720004 = 21983^2 + 132498^2 .

It is a cyclic number.

It is not a de Polignac number, because 18038972293 - 2¹⁷ = 18038841221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18038972293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18038972297) 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, 14713068 + ... + 14714293.

It is an arithmetic number, because the mean of its divisors is an integer number (4517100067).

Almost surely, 2^18038972293 is an apocalyptic number.

It is an amenable number.

18038972293 is a deficient number, since it is larger than the sum of its proper divisors (29427975).

18038972293 is an equidigital number, since it uses as much as digits as its factorization.

18038972293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29427974.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 18038972293 in words is "eighteen billion, thirty-eight million, nine hundred seventy-two thousand, two hundred ninety-three".