22381400 has 48 divisors (see below), whose sum is σ = 53166240. Its totient is φ = 8758400.

The previous prime is 22381397. The next prime is 22381427. The reversal of 22381400 is 418322.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8210 + ... + 10590.

It is an arithmetic number, because the mean of its divisors is an integer number (1107630).

Almost surely, 2^22381400 is an apocalyptic number.

22381400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22381400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26583120).

22381400 is an abundant number, since it is smaller than the sum of its proper divisors (30784840).

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

22381400 is a wasteful number, since it uses less digits than its factorization.

22381400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2444 (or 2435 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 22381400 is about 4730.8984347585. The cubic root of 22381400 is about 281.8139040123.

Adding to 22381400 its reverse (418322), we get a palindrome (22799722).

The spelling of 22381400 in words is "twenty-two million, three hundred eighty-one thousand, four hundred".