18913903630 has 8 divisors (see below), whose sum is σ = 34045026552. Its totient is φ = 7565561448.

The previous prime is 18913903627. The next prime is 18913903637. The reversal of 18913903630 is 3630931981.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18913903637) 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, 945695172 + ... + 945695191.

It is an arithmetic number, because the mean of its divisors is an integer number (4255628319).

Almost surely, 2^18913903630 is an apocalyptic number.

18913903630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18913903630 is a deficient number, since it is larger than the sum of its proper divisors (15131122922).

18913903630 is a wasteful number, since it uses less digits than its factorization.

18913903630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891390370.

The product of its (nonzero) digits is 104976, while the sum is 43.

The spelling of 18913903630 in words is "eighteen billion, nine hundred thirteen million, nine hundred three thousand, six hundred thirty".