18039698407 has 4 divisors (see below), whose sum is σ = 18040621320. Its totient is φ = 18038775496.

The previous prime is 18039698387. The next prime is 18039698431. The reversal of 18039698407 is 70489693081.

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 18039698407 - 2⁷ = 18039698279 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 (18039693407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431488 + ... + 471445.

It is an arithmetic number, because the mean of its divisors is an integer number (4510155330).

Almost surely, 2^18039698407 is an apocalyptic number.

18039698407 is a deficient number, since it is larger than the sum of its proper divisors (922913).

18039698407 is an equidigital number, since it uses as much as digits as its factorization.

18039698407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922912.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 18039698407 in words is "eighteen billion, thirty-nine million, six hundred ninety-eight thousand, four hundred seven".