22857813 has 24 divisors (see below), whose sum is σ = 36173280. Its totient is φ = 13793760.

The previous prime is 22857803. The next prime is 22857851. The reversal of 22857813 is 31875822.

It is not a de Polignac number, because 22857813 - 2¹² = 22853717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22857803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36618 + ... + 37236.

It is an arithmetic number, because the mean of its divisors is an integer number (1507220).

Almost surely, 2^22857813 is an apocalyptic number.

It is an amenable number.

22857813 is a deficient number, since it is larger than the sum of its proper divisors (13315467).

22857813 is a wasteful number, since it uses less digits than its factorization.

22857813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009 (or 1006 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 22857813 is about 4780.9845220415. The cubic root of 22857813 is about 283.7994558883.

Subtracting 22857813 from its reverse (31875822), we obtain a square (9018009 = 3003²).

The spelling of 22857813 in words is "twenty-two million, eight hundred fifty-seven thousand, eight hundred thirteen".