18390489407 has 4 divisors (see below), whose sum is σ = 18392382096. Its totient is φ = 18388596720.

The previous prime is 18390489391. The next prime is 18390489427. The reversal of 18390489407 is 70498409381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18390489407 - 2⁴ = 18390489391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18390489427) 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, 931694 + ... + 951227.

It is an arithmetic number, because the mean of its divisors is an integer number (4598095524).

Almost surely, 2^18390489407 is an apocalyptic number.

18390489407 is a deficient number, since it is larger than the sum of its proper divisors (1892689).

18390489407 is an equidigital number, since it uses as much as digits as its factorization.

18390489407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892688.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The spelling of 18390489407 in words is "eighteen billion, three hundred ninety million, four hundred eighty-nine thousand, four hundred seven".