18890438107293 has 24 divisors (see below), whose sum is σ = 28167089423616. Its totient is φ = 12187075924800.

The previous prime is 18890438107259. The next prime is 18890438107349. The reversal of 18890438107293 is 39270183409881.

18890438107293 is a `hidden beast` number, since 1 + 8 + 8 + 9 + 0 + 438 + 107 + 2 + 93 = 666.

It is not a de Polignac number, because 18890438107293 - 2²⁸ = 18890169671837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18890438107293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18890438107223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10661446 + ... + 12306392.

It is an arithmetic number, because the mean of its divisors is an integer number (1173628725984).

Almost surely, 2^{18890438107293} is an apocalyptic number.

It is an amenable number.

18890438107293 is a deficient number, since it is larger than the sum of its proper divisors (9276651316323).

18890438107293 is a wasteful number, since it uses less digits than its factorization.

18890438107293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686145 (or 1686142 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 63.

The spelling of 18890438107293 in words is "eighteen trillion, eight hundred ninety billion, four hundred thirty-eight million, one hundred seven thousand, two hundred ninety-three".