22396781 has 4 divisors (see below), whose sum is σ = 24432864. Its totient is φ = 20360700.

The previous prime is 22396747. The next prime is 22396789. The reversal of 22396781 is 18769322.

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 a cyclic number.

It is not a de Polignac number, because 22396781 - 2¹⁰ = 22395757 is a prime.

It is a super-2 number, since 2×22396781² = 1003231598323922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22396789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1018025 + ... + 1018046.

It is an arithmetic number, because the mean of its divisors is an integer number (6108216).

Almost surely, 2^22396781 is an apocalyptic number.

It is an amenable number.

22396781 is a deficient number, since it is larger than the sum of its proper divisors (2036083).

22396781 is a wasteful number, since it uses less digits than its factorization.

22396781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036082.

The product of its digits is 36288, while the sum is 38.

The square root of 22396781 is about 4732.5237453181. The cubic root of 22396781 is about 281.8784455080.

The spelling of 22396781 in words is "twenty-two million, three hundred ninety-six thousand, seven hundred eighty-one".