22991340 has 48 divisors (see below), whose sum is σ = 64868832. Its totient is φ = 6084096.

The previous prime is 22991333. The next prime is 22991357. The reversal of 22991340 is 4319922.

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 = 22991298 and 22991307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6822 + ... + 9618.

It is an arithmetic number, because the mean of its divisors is an integer number (1351434).

Almost surely, 2^22991340 is an apocalyptic number.

22991340 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 22991340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32434416).

22991340 is an abundant number, since it is smaller than the sum of its proper divisors (41877492).

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

22991340 is a wasteful number, since it uses less digits than its factorization.

22991340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946 (or 2944 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 22991340 is about 4794.9285708965. The cubic root of 22991340 is about 284.3510009132.

The spelling of 22991340 in words is "twenty-two million, nine hundred ninety-one thousand, three hundred forty".