18880665 has 8 divisors (see below), whose sum is σ = 30209088. Its totient is φ = 10069680.

The previous prime is 18880639. The next prime is 18880669. The reversal of 18880665 is 56608881.

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

It is not a de Polignac number, because 18880665 - 2⁵ = 18880633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18880669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629341 + ... + 629370.

It is an arithmetic number, because the mean of its divisors is an integer number (3776136).

Almost surely, 2^18880665 is an apocalyptic number.

18880665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18880665 is a deficient number, since it is larger than the sum of its proper divisors (11328423).

18880665 is a wasteful number, since it uses less digits than its factorization.

18880665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258719.

The product of its (nonzero) digits is 92160, while the sum is 42.

The square root of 18880665 is about 4345.1887185714. The cubic root of 18880665 is about 266.2803355415.

The spelling of 18880665 in words is "eighteen million, eight hundred eighty thousand, six hundred sixty-five".