18641408 has 40 divisors (see below), whose sum is σ = 38890368. Its totient is φ = 8909824.

The previous prime is 18641387. The next prime is 18641419. The reversal of 18641408 is 80414681.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10985 + ... + 12567.

Almost surely, 2^18641408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18641408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19445184).

18641408 is an abundant number, since it is smaller than the sum of its proper divisors (20248960).

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

18641408 is an equidigital number, since it uses as much as digits as its factorization.

18641408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624 (or 1608 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 18641408 is about 4317.5696867567. The cubic root of 18641408 is about 265.1507768995.

The spelling of 18641408 in words is "eighteen million, six hundred forty-one thousand, four hundred eight".