22400031 has 8 divisors (see below), whose sum is σ = 31438720. Its totient is φ = 14147352.

The previous prime is 22400029. The next prime is 22400039. The reversal of 22400031 is 13000422.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22400031 - 2¹ = 22400029 is a prime.

It is a super-2 number, since 2×22400031² = 1003522777601922, 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 (22400039) 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, 196435 + ... + 196548.

It is an arithmetic number, because the mean of its divisors is an integer number (3929840).

Almost surely, 2^22400031 is an apocalyptic number.

22400031 is a deficient number, since it is larger than the sum of its proper divisors (9038689).

22400031 is a wasteful number, since it uses less digits than its factorization.

22400031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393005.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 22400031 is about 4732.8671014513. The cubic root of 22400031 is about 281.8920793220.

Adding to 22400031 its reverse (13000422), we get a palindrome (35400453).

The spelling of 22400031 in words is "twenty-two million, four hundred thousand, thirty-one".