22157857 has 16 divisors (see below), whose sum is σ = 24544960. Its totient is φ = 19922112.

The previous prime is 22157797. The next prime is 22157867. The reversal of 22157857 is 75875122.

It is a cyclic number.

It is not a de Polignac number, because 22157857 - 2¹⁹ = 21633569 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (22157867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29863 + ... + 30595.

It is an arithmetic number, because the mean of its divisors is an integer number (1534060).

Almost surely, 2^22157857 is an apocalyptic number.

It is an amenable number.

22157857 is a deficient number, since it is larger than the sum of its proper divisors (2387103).

22157857 is a wasteful number, since it uses less digits than its factorization.

22157857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832.

The product of its digits is 39200, while the sum is 37.

The square root of 22157857 is about 4707.2132945088. The cubic root of 22157857 is about 280.8725206219.

The spelling of 22157857 in words is "twenty-two million, one hundred fifty-seven thousand, eight hundred fifty-seven".