18901645 has 16 divisors (see below), whose sum is σ = 26183808. Its totient is φ = 12830400.

The previous prime is 18901613. The next prime is 18901651. The reversal of 18901645 is 54610981.

It is not a de Polignac number, because 18901645 - 2⁵ = 18901613 is a prime.

It is a super-3 number, since 3×18901645³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18901645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 862 + ... + 6208.

It is an arithmetic number, because the mean of its divisors is an integer number (1636488).

Almost surely, 2^18901645 is an apocalyptic number.

It is an amenable number.

18901645 is a deficient number, since it is larger than the sum of its proper divisors (7282163).

18901645 is a wasteful number, since it uses less digits than its factorization.

18901645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5460.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 18901645 is about 4347.6022127145. The cubic root of 18901645 is about 266.3789283519.

The spelling of 18901645 in words is "eighteen million, nine hundred one thousand, six hundred forty-five".