22431402 has 48 divisors (see below), whose sum is σ = 56609280. Its totient is φ = 6286176.

The previous prime is 22431391. The next prime is 22431427. The reversal of 22431402 is 20413422.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4999 + ... + 8357.

It is an arithmetic number, because the mean of its divisors is an integer number (1179360).

Almost surely, 2^22431402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22431402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28304640).

22431402 is an abundant number, since it is smaller than the sum of its proper divisors (34177878).

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

22431402 is a wasteful number, since it uses less digits than its factorization.

22431402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3427 (or 3424 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 22431402 is about 4736.1801063726. The cubic root of 22431402 is about 282.0236135349.

Adding to 22431402 its reverse (20413422), we get a palindrome (42844824).

It can be divided in two parts, 224 and 31402, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 22431402 in words is "twenty-two million, four hundred thirty-one thousand, four hundred two".