18480891 has 32 divisors (see below), whose sum is σ = 30223872. Its totient is φ = 9884160.

The previous prime is 18480883. The next prime is 18480893. The reversal of 18480891 is 19808481.

It is a happy number.

It is not a de Polignac number, because 18480891 - 2³ = 18480883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (18480893) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8931 + ... + 10803.

It is an arithmetic number, because the mean of its divisors is an integer number (944496).

Almost surely, 2^18480891 is an apocalyptic number.

18480891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18480891 is a deficient number, since it is larger than the sum of its proper divisors (11742981).

18480891 is a wasteful number, since it uses less digits than its factorization.

18480891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923.

The product of its (nonzero) digits is 18432, while the sum is 39.

The square root of 18480891 is about 4298.9406834708. The cubic root of 18480891 is about 264.3875306056.

The spelling of 18480891 in words is "eighteen million, four hundred eighty thousand, eight hundred ninety-one".