18881465 has 16 divisors (see below), whose sum is σ = 23593680. Its totient is φ = 14488320.

The previous prime is 18881461. The next prime is 18881483. The reversal of 18881465 is 56418881.

It can be written as a sum of positive squares in 8 ways, for example, as 3136441 + 15745024 = 1771^2 + 3968^2 .

It is not a de Polignac number, because 18881465 - 2² = 18881461 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18881461) 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, 28235 + ... + 28895.

It is an arithmetic number, because the mean of its divisors is an integer number (1474605).

Almost surely, 2^18881465 is an apocalyptic number.

It is an amenable number.

18881465 is a deficient number, since it is larger than the sum of its proper divisors (4712215).

18881465 is a wasteful number, since it uses less digits than its factorization.

18881465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892.

The product of its digits is 61440, while the sum is 41.

The square root of 18881465 is about 4345.2807734369. The cubic root of 18881465 is about 266.2840963776.

The spelling of 18881465 in words is "eighteen million, eight hundred eighty-one thousand, four hundred sixty-five".