18961670 has 64 divisors (see below), whose sum is σ = 42771456. Its totient is φ = 5892480.

The previous prime is 18961661. The next prime is 18961687. The reversal of 18961670 is 7616981.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60815 + ... + 61125.

It is an arithmetic number, because the mean of its divisors is an integer number (668304).

Almost surely, 2^18961670 is an apocalyptic number.

18961670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 4354×4355.

18961670 is an abundant number, since it is smaller than the sum of its proper divisors (23809786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18961670 is a wasteful number, since it uses less digits than its factorization.

18961670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 18961670 is about 4354.4999712941. The cubic root of 18961670 is about 266.6606057650.

The spelling of 18961670 in words is "eighteen million, nine hundred sixty-one thousand, six hundred seventy".