18699408 has 120 divisors (see below), whose sum is σ = 64454208. Its totient is φ = 4928256.

The previous prime is 18699389. The next prime is 18699409. The reversal of 18699408 is 80499681.

It is not an unprimeable number, because it can be changed into a prime (18699409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12391 + ... + 13817.

Almost surely, 2^18699408 is an apocalyptic number.

18699408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18699408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32227104).

18699408 is an abundant number, since it is smaller than the sum of its proper divisors (45754800).

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

18699408 is a wasteful number, since it uses less digits than its factorization.

18699408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461 (or 1452 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 18699408 is about 4324.2812119473. The cubic root of 18699408 is about 265.4254847435.

The spelling of 18699408 in words is "eighteen million, six hundred ninety-nine thousand, four hundred eight".