22401378 has 12 divisors (see below), whose sum is σ = 48536358. Its totient is φ = 7467120.

The previous prime is 22401377. The next prime is 22401397. The reversal of 22401378 is 87310422.

It can be written as a sum of positive squares in only one way, i.e., 11923209 + 10478169 = 3453^2 + 3237^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (22401371) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 622243 + ... + 622278.

Almost surely, 2^22401378 is an apocalyptic number.

22401378 is an abundant number, since it is smaller than the sum of its proper divisors (26134980).

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

22401378 is a wasteful number, since it uses less digits than its factorization.

22401378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244529 (or 1244526 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 22401378 is about 4733.0094020612. The cubic root of 22401378 is about 281.8977296270.

The spelling of 22401378 in words is "twenty-two million, four hundred one thousand, three hundred seventy-eight".