22640439 has 16 divisors (see below), whose sum is σ = 31077632. Its totient is φ = 14655168.

The previous prime is 22640437. The next prime is 22640461. The reversal of 22640439 is 93404622.

It is not a de Polignac number, because 22640439 - 2¹ = 22640437 is a prime.

It is a super-2 number, since 2×22640439² = 1025178956225442, 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 (22640437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13902 + ... + 15444.

It is an arithmetic number, because the mean of its divisors is an integer number (1942352).

Almost surely, 2^22640439 is an apocalyptic number.

22640439 is a deficient number, since it is larger than the sum of its proper divisors (8437193).

22640439 is a wasteful number, since it uses less digits than its factorization.

22640439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 22640439 is about 4758.1970324904. The cubic root of 22640439 is about 282.8969604112.

The spelling of 22640439 in words is "twenty-two million, six hundred forty thousand, four hundred thirty-nine".