21790452 has 12 divisors (see below), whose sum is σ = 50844416. Its totient is φ = 7263480.

The previous prime is 21790451. The next prime is 21790459. The reversal of 21790452 is 25409712.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21790451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 907924 + ... + 907947.

Almost surely, 2^21790452 is an apocalyptic number.

It is an amenable number.

21790452 is an abundant number, since it is smaller than the sum of its proper divisors (29053964).

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

21790452 is a wasteful number, since it uses less digits than its factorization.

21790452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815878 (or 1815876 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 21790452 is about 4668.0244215299. The cubic root of 21790452 is about 279.3114544501.

The spelling of 21790452 in words is "twenty-one million, seven hundred ninety thousand, four hundred fifty-two".