18881065 has 16 divisors (see below), whose sum is σ = 26087040. Its totient is φ = 12850560.

The previous prime is 18881039. The next prime is 18881081. The reversal of 18881065 is 56018881.

It is not a de Polignac number, because 18881065 - 2⁷ = 18880937 is a prime.

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, 2925 + ... + 6805.

It is an arithmetic number, because the mean of its divisors is an integer number (1630440).

Almost surely, 2^18881065 is an apocalyptic number.

It is an amenable number.

18881065 is a deficient number, since it is larger than the sum of its proper divisors (7205975).

18881065 is a wasteful number, since it uses less digits than its factorization.

18881065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4032.

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 18881065 is about 4345.2347462479. The cubic root of 18881065 is about 266.2822159729.

The spelling of 18881065 in words is "eighteen million, eight hundred eighty-one thousand, sixty-five".