18138901 has 16 divisors (see below), whose sum is σ = 21196800. Its totient is φ = 15346800.

The previous prime is 18138871. The next prime is 18138919. The reversal of 18138901 is 10983181.

It is a cyclic number.

It is not a de Polignac number, because 18138901 - 2²¹ = 16041749 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 (18138931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11596 + ... + 13066.

It is an arithmetic number, because the mean of its divisors is an integer number (1324800).

Almost surely, 2^18138901 is an apocalyptic number.

18138901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18138901 is a deficient number, since it is larger than the sum of its proper divisors (3057899).

18138901 is a wasteful number, since it uses less digits than its factorization.

18138901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 18138901 is about 4258.9788682265. The cubic root of 18138901 is about 262.7465306019.

The spelling of 18138901 in words is "eighteen million, one hundred thirty-eight thousand, nine hundred one".