22479840 has 144 divisors (see below), whose sum is σ = 78191568. Its totient is φ = 5879808.

The previous prime is 22479829. The next prime is 22479857. The reversal of 22479840 is 4897422.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 22479795 and 22479804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96364 + ... + 96596.

It is an arithmetic number, because the mean of its divisors is an integer number (542997).

Almost surely, 2^22479840 is an apocalyptic number.

22479840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22479840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39095784).

22479840 is an abundant number, since it is smaller than the sum of its proper divisors (55711728).

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

22479840 is a wasteful number, since it uses less digits than its factorization.

22479840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 22479840 is about 4741.2909634402. The cubic root of 22479840 is about 282.2264666410.

The spelling of 22479840 in words is "twenty-two million, four hundred seventy-nine thousand, eight hundred forty".