18121632 has 24 divisors (see below), whose sum is σ = 47569536. Its totient is φ = 6040512.

The previous prime is 18121613. The next prime is 18121633. The reversal of 18121632 is 23612181.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

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

It is not an unprimeable number, because it can be changed into a prime (18121633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94288 + ... + 94479.

It is an arithmetic number, because the mean of its divisors is an integer number (1982064).

Almost surely, 2^18121632 is an apocalyptic number.

18121632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18121632 is an abundant number, since it is smaller than the sum of its proper divisors (29447904).

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

18121632 is a wasteful number, since it uses less digits than its factorization.

18121632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188780 (or 188772 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 18121632 is about 4256.9510215646. The cubic root of 18121632 is about 262.6631221947.

The spelling of 18121632 in words is "eighteen million, one hundred twenty-one thousand, six hundred thirty-two".