22491490 has 48 divisors (see below), whose sum is σ = 47536632. Its totient is φ = 7639296.

The previous prime is 22491481. The next prime is 22491503. The reversal of 22491490 is 9419422.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20511841 + 1979649 = 4529^2 + 1407^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96414 + ... + 96646.

Almost surely, 2^22491490 is an apocalyptic number.

22491490 is an abundant number, since it is smaller than the sum of its proper divisors (25045142).

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

22491490 is a wasteful number, since it uses less digits than its factorization.

22491490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 22491490 is about 4742.5193726542. The cubic root of 22491490 is about 282.2752121023.

The spelling of 22491490 in words is "twenty-two million, four hundred ninety-one thousand, four hundred ninety".