22857491 has 4 divisors (see below), whose sum is σ = 23024472. Its totient is φ = 22690512.

The previous prime is 22857421. The next prime is 22857511. The reversal of 22857491 is 19475822.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22857491 - 2¹⁸ = 22595347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22857421) 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, 83285 + ... + 83558.

It is an arithmetic number, because the mean of its divisors is an integer number (5756118).

Almost surely, 2^22857491 is an apocalyptic number.

22857491 is a deficient number, since it is larger than the sum of its proper divisors (166981).

22857491 is a wasteful number, since it uses less digits than its factorization.

22857491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166980.

The product of its digits is 40320, while the sum is 38.

The square root of 22857491 is about 4780.9508468504. The cubic root of 22857491 is about 283.7981232462.

The spelling of 22857491 in words is "twenty-two million, eight hundred fifty-seven thousand, four hundred ninety-one".