18811408 has 40 divisors (see below), whose sum is σ = 45443520. Its totient is φ = 7328640.

The previous prime is 18811393. The next prime is 18811409. The reversal of 18811408 is 80411881.

It is a self number, because there is not a number n which added to its sum of digits gives 18811408.

It is not an unprimeable number, because it can be changed into a prime (18811409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6403 + ... + 8866.

It is an arithmetic number, because the mean of its divisors is an integer number (1136088).

Almost surely, 2^18811408 is an apocalyptic number.

It is an amenable number.

18811408 is an abundant number, since it is smaller than the sum of its proper divisors (26632112).

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

18811408 is a wasteful number, since it uses less digits than its factorization.

18811408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15295 (or 15289 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 31.

The square root of 18811408 is about 4337.2120077303. The cubic root of 18811408 is about 265.9543517499.

The spelling of 18811408 in words is "eighteen million, eight hundred eleven thousand, four hundred eight".