18235961439 has 8 divisors (see below), whose sum is σ = 24372647040. Its totient is φ = 12128291736.

The previous prime is 18235961399. The next prime is 18235961449. The reversal of 18235961439 is 93416953281.

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

It is not a de Polignac number, because 18235961439 - 2¹⁵ = 18235928671 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18235961391 and 18235961400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18235961449) 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, 7252507 + ... + 7255020.

It is an arithmetic number, because the mean of its divisors is an integer number (3046580880).

Almost surely, 2^18235961439 is an apocalyptic number.

18235961439 is a deficient number, since it is larger than the sum of its proper divisors (6136685601).

18235961439 is a wasteful number, since it uses less digits than its factorization.

18235961439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14507949.

The product of its digits is 1399680, while the sum is 51.

The spelling of 18235961439 in words is "eighteen billion, two hundred thirty-five million, nine hundred sixty-one thousand, four hundred thirty-nine".