22897840 has 80 divisors (see below), whose sum is σ = 62853120. Its totient is φ = 7591680.

The previous prime is 22897829. The next prime is 22897843. The reversal of 22897840 is 4879822.

22897840 = 414² + 415² + ... + 518².

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×22897840² = 1048622153331200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 22897793 and 22897802.

It is not an unprimeable number, because it can be changed into a prime (22897843) 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, 16701 + ... + 18019.

It is an arithmetic number, because the mean of its divisors is an integer number (785664).

Almost surely, 2^22897840 is an apocalyptic number.

22897840 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 22897840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31426560).

22897840 is an abundant number, since it is smaller than the sum of its proper divisors (39955280).

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

22897840 is a wasteful number, since it uses less digits than its factorization.

22897840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370 (or 1364 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 22897840 is about 4785.1687535551. The cubic root of 22897840 is about 283.9650158587.

The spelling of 22897840 in words is "twenty-two million, eight hundred ninety-seven thousand, eight hundred forty".