22378643 has 12 divisors (see below), whose sum is σ = 26462592. Its totient is φ = 18864720.

The previous prime is 22378639. The next prime is 22378649. The reversal of 22378643 is 34687322.

It is not a de Polignac number, because 22378643 - 2² = 22378639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22378649) 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 11 ways as a sum of consecutive naturals, for example, 755 + ... + 6732.

It is an arithmetic number, because the mean of its divisors is an integer number (2205216).

Almost surely, 2^22378643 is an apocalyptic number.

22378643 is a deficient number, since it is larger than the sum of its proper divisors (4083949).

22378643 is an equidigital number, since it uses as much as digits as its factorization.

22378643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7562 (or 7555 counting only the distinct ones).

The product of its digits is 48384, while the sum is 35.

The square root of 22378643 is about 4730.6070434988. The cubic root of 22378643 is about 281.8023320099.

The spelling of 22378643 in words is "twenty-two million, three hundred seventy-eight thousand, six hundred forty-three".