18421696 has 28 divisors (see below), whose sum is σ = 37065712. Its totient is φ = 9082368.

The previous prime is 18421681. The next prime is 18421709. The reversal of 18421696 is 69612481.

It is a happy number.

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, 2701 + ... + 6643.

Almost surely, 2^18421696 is an apocalyptic number.

18421696 is a gapful number since it is divisible by the number (16) 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 18421696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18532856).

18421696 is an abundant number, since it is smaller than the sum of its proper divisors (18644016).

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

18421696 is an equidigital number, since it uses as much as digits as its factorization.

18421696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028 (or 4018 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 18421696 is about 4292.0503258932. The cubic root of 18421696 is about 264.1049475616.

The spelling of 18421696 in words is "eighteen million, four hundred twenty-one thousand, six hundred ninety-six".