22406538 has 48 divisors (see below), whose sum is σ = 56306880. Its totient is φ = 5818560.

The previous prime is 22406537. The next prime is 22406539. The reversal of 22406538 is 83560422.

It is an interprime number because it is at equal distance from previous prime (22406537) and next prime (22406539).

It is not an unprimeable number, because it can be changed into a prime (22406537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2878 + ... + 7286.

It is an arithmetic number, because the mean of its divisors is an integer number (1173060).

Almost surely, 2^22406538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22406538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28153440).

22406538 is an abundant number, since it is smaller than the sum of its proper divisors (33900342).

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

22406538 is a wasteful number, since it uses less digits than its factorization.

22406538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4443 (or 4432 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 22406538 is about 4733.5544784020. The cubic root of 22406538 is about 281.9193723523.

It can be divided in two parts, 2240 and 6538, that added together give a palindrome (8778).

The spelling of 22406538 in words is "twenty-two million, four hundred six thousand, five hundred thirty-eight".