22401684 has 72 divisors (see below), whose sum is σ = 61865440. Its totient is φ = 7068384.

The previous prime is 22401679. The next prime is 22401689. The reversal of 22401684 is 48610422.

It is an interprime number because it is at equal distance from previous prime (22401679) and next prime (22401689).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22401689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17862 + ... + 19074.

Almost surely, 2^22401684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22401684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30932720).

22401684 is an abundant number, since it is smaller than the sum of its proper divisors (39463756).

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

22401684 is a wasteful number, since it uses less digits than its factorization.

22401684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251 (or 1237 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 22401684 is about 4733.0417281068. The cubic root of 22401684 is about 281.8990131836.

The spelling of 22401684 in words is "twenty-two million, four hundred one thousand, six hundred eighty-four".