22078405 has 4 divisors (see below), whose sum is σ = 26494092. Its totient is φ = 17662720.

The previous prime is 22078379. The next prime is 22078471. The reversal of 22078405 is 50487022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12830724 + 9247681 = 3582^2 + 3041^2 .

It is not a de Polignac number, because 22078405 - 2¹⁵ = 22045637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2207836 + ... + 2207845.

It is an arithmetic number, because the mean of its divisors is an integer number (6623523).

Almost surely, 2^22078405 is an apocalyptic number.

It is an amenable number.

22078405 is a deficient number, since it is larger than the sum of its proper divisors (4415687).

22078405 is an equidigital number, since it uses as much as digits as its factorization.

22078405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4415686.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 22078405 is about 4698.7663274523. The cubic root of 22078405 is about 280.5364079487.

The spelling of 22078405 in words is "twenty-two million, seventy-eight thousand, four hundred five".