21398692 has 36 divisors (see below), whose sum is σ = 44592240. Its totient is φ = 8954064.

The previous prime is 21398687. The next prime is 21398701. The reversal of 21398692 is 29689312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7159 + ... + 9697.

Almost surely, 2^21398692 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 21398692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22296120).

21398692 is an abundant number, since it is smaller than the sum of its proper divisors (23193548).

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

21398692 is a wasteful number, since it uses less digits than its factorization.

21398692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2600 (or 2591 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 21398692 is about 4625.8720258995. The cubic root of 21398692 is about 277.6274532890.

The spelling of 21398692 in words is "twenty-one million, three hundred ninety-eight thousand, six hundred ninety-two".