22405940 has 24 divisors (see below), whose sum is σ = 49529760. Its totient is φ = 8490528.

The previous prime is 22405937. The next prime is 22405961. The reversal of 22405940 is 4950422.

It is a super-2 number, since 2×22405940² = 1004052294567200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29102 + ... + 29861.

It is an arithmetic number, because the mean of its divisors is an integer number (2063740).

Almost surely, 2^22405940 is an apocalyptic number.

22405940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22405940 is an abundant number, since it is smaller than the sum of its proper divisors (27123820).

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

22405940 is a wasteful number, since it uses less digits than its factorization.

22405940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58991 (or 58989 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 22405940 is about 4733.4913119177. The cubic root of 22405940 is about 281.9168643152.

The spelling of 22405940 in words is "twenty-two million, four hundred five thousand, nine hundred forty".