18500017390 has 16 divisors (see below), whose sum is σ = 34200032832. Its totient is φ = 7200006624.

The previous prime is 18500017381. The next prime is 18500017397. The reversal of 18500017390 is 9371000581.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18500017397) 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, 24999654 + ... + 25000393.

It is an arithmetic number, because the mean of its divisors is an integer number (2137502052).

Almost surely, 2^18500017390 is an apocalyptic number.

18500017390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18500017390 is a deficient number, since it is larger than the sum of its proper divisors (15700015442).

18500017390 is a wasteful number, since it uses less digits than its factorization.

18500017390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50000091.

The product of its (nonzero) digits is 7560, while the sum is 34.

The spelling of 18500017390 in words is "eighteen billion, five hundred million, seventeen thousand, three hundred ninety".