22491858 has 16 divisors (see below), whose sum is σ = 47351520. Its totient is φ = 7102656.

The previous prime is 22491857. The next prime is 22491863. The reversal of 22491858 is 85819422.

It is not an unprimeable number, because it can be changed into a prime (22491857) 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 7 ways as a sum of consecutive naturals, for example, 98535 + ... + 98762.

It is an arithmetic number, because the mean of its divisors is an integer number (2959470).

Almost surely, 2^22491858 is an apocalyptic number.

22491858 is an abundant number, since it is smaller than the sum of its proper divisors (24859662).

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

22491858 is a wasteful number, since it uses less digits than its factorization.

22491858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197321.

The product of its digits is 46080, while the sum is 39.

The square root of 22491858 is about 4742.5581704392. The cubic root of 22491858 is about 282.2767515988.

The spelling of 22491858 in words is "twenty-two million, four hundred ninety-one thousand, eight hundred fifty-eight".