22857440 has 48 divisors (see below), whose sum is σ = 54286848. Its totient is φ = 9094656.

The previous prime is 22857421. The next prime is 22857511. The reversal of 22857440 is 4475822.

It is a super-3 number, since 3×22857440³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 22857397 and 22857406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59489 + ... + 59871.

It is an arithmetic number, because the mean of its divisors is an integer number (1130976).

Almost surely, 2^22857440 is an apocalyptic number.

22857440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22857440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27143424).

22857440 is an abundant number, since it is smaller than the sum of its proper divisors (31429408).

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

22857440 is a wasteful number, since it uses less digits than its factorization.

22857440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 763 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 22857440 is about 4780.9455131804. The cubic root of 22857440 is about 283.7979121744.

The spelling of 22857440 in words is "twenty-two million, eight hundred fifty-seven thousand, four hundred forty".