22378013 has 4 divisors (see below), whose sum is σ = 25574880. Its totient is φ = 19181148.

The previous prime is 22378009. The next prime is 22378073. The reversal of 22378013 is 31087322.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22378013 - 2² = 22378009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22378073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1598423 + ... + 1598436.

It is an arithmetic number, because the mean of its divisors is an integer number (6393720).

Almost surely, 2^22378013 is an apocalyptic number.

It is an amenable number.

22378013 is a deficient number, since it is larger than the sum of its proper divisors (3196867).

22378013 is an equidigital number, since it uses as much as digits as its factorization.

22378013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3196866.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 22378013 is about 4730.5404553814. The cubic root of 22378013 is about 281.7996875670.

The spelling of 22378013 in words is "twenty-two million, three hundred seventy-eight thousand, thirteen".