18891960 has 32 divisors (see below), whose sum is σ = 56676240. Its totient is φ = 5037824.

The previous prime is 18891953. The next prime is 18891973. The reversal of 18891960 is 6919881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78597 + ... + 78836.

Almost surely, 2^18891960 is an apocalyptic number.

18891960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18891960 is an abundant number, since it is smaller than the sum of its proper divisors (37784280).

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

18891960 is a wasteful number, since it uses less digits than its factorization.

18891960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157447 (or 157443 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 18891960 is about 4346.4882376466. The cubic root of 18891960 is about 266.3334240112. Note that the first 3 decimals are identical.

The spelling of 18891960 in words is "eighteen million, eight hundred ninety-one thousand, nine hundred sixty".