22491790 has 8 divisors (see below), whose sum is σ = 40485240. Its totient is φ = 8996712.

The previous prime is 22491787. The next prime is 22491793. The reversal of 22491790 is 9719422.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22491787) and next prime (22491793).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22491793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1124580 + ... + 1124599.

It is an arithmetic number, because the mean of its divisors is an integer number (5060655).

Almost surely, 2^22491790 is an apocalyptic number.

22491790 is a deficient number, since it is larger than the sum of its proper divisors (17993450).

22491790 is a wasteful number, since it uses less digits than its factorization.

22491790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249186.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 22491790 is about 4742.5510013072. The cubic root of 22491790 is about 282.2764671279.

The spelling of 22491790 in words is "twenty-two million, four hundred ninety-one thousand, seven hundred ninety".