22400231 has 4 divisors (see below), whose sum is σ = 25600272. Its totient is φ = 19200192.

The previous prime is 22400219. The next prime is 22400243. The reversal of 22400231 is 13200422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13200422 = 2 ⋅6600211.

It is an interprime number because it is at equal distance from previous prime (22400219) and next prime (22400243).

It is a cyclic number.

It is not a de Polignac number, because 22400231 - 2⁶ = 22400167 is a prime.

It is a super-2 number, since 2×22400231² = 1003540697706722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22400251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1600010 + ... + 1600023.

It is an arithmetic number, because the mean of its divisors is an integer number (6400068).

Almost surely, 2^22400231 is an apocalyptic number.

22400231 is a deficient number, since it is larger than the sum of its proper divisors (3200041).

22400231 is an equidigital number, since it uses as much as digits as its factorization.

22400231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200040.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 22400231 is about 4732.8882302459. Note that the first 3 decimals coincide. The cubic root of 22400231 is about 281.8929182828.

Adding to 22400231 its reverse (13200422), we get a palindrome (35600653).

The spelling of 22400231 in words is "twenty-two million, four hundred thousand, two hundred thirty-one".