18396985231 has 8 divisors (see below), whose sum is σ = 18805746960. Its totient is φ = 17991455232.

The previous prime is 18396985213. The next prime is 18396985253. The reversal of 18396985231 is 13258969381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18396985231 - 2²¹ = 18394888079 is a prime.

It is a super-2 number, since 2×18396985231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18396985291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 796420 + ... + 819193.

It is an arithmetic number, because the mean of its divisors is an integer number (2350718370).

Almost surely, 2^18396985231 is an apocalyptic number.

18396985231 is a deficient number, since it is larger than the sum of its proper divisors (408761729).

18396985231 is a wasteful number, since it uses less digits than its factorization.

18396985231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615865.

The product of its digits is 2799360, while the sum is 55.

The spelling of 18396985231 in words is "eighteen billion, three hundred ninety-six million, nine hundred eighty-five thousand, two hundred thirty-one".