22815438 has 16 divisors (see below), whose sum is σ = 45705216. Its totient is φ = 7592760.

The previous prime is 22815433. The next prime is 22815439. The reversal of 22815438 is 83451822.

It is a super-2 number, since 2×22815438² = 1041088422263688, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22815399 and 22815408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22815433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1395 + ... + 6897.

It is an arithmetic number, because the mean of its divisors is an integer number (2856576).

Almost surely, 2^22815438 is an apocalyptic number.

22815438 is an abundant number, since it is smaller than the sum of its proper divisors (22889778).

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

22815438 is a wasteful number, since it uses less digits than its factorization.

22815438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6199.

The product of its digits is 15360, while the sum is 33.

The square root of 22815438 is about 4776.5508476305. The cubic root of 22815438 is about 283.6239733508.

The spelling of 22815438 in words is "twenty-two million, eight hundred fifteen thousand, four hundred thirty-eight".