22639440 has 40 divisors (see below), whose sum is σ = 70183008. Its totient is φ = 6037120.

The previous prime is 22639439. The next prime is 22639471. The reversal of 22639440 is 4493622.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 22639398 and 22639407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46926 + ... + 47405.

Almost surely, 2^22639440 is an apocalyptic number.

22639440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22639440 is an abundant number, since it is smaller than the sum of its proper divisors (47543568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22639440 is a wasteful number, since it uses less digits than its factorization.

22639440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94347 (or 94341 counting only the distinct ones).

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

The square root of 22639440 is about 4758.0920545950. The cubic root of 22639440 is about 282.8927994463.

The spelling of 22639440 in words is "twenty-two million, six hundred thirty-nine thousand, four hundred forty".