22397940 has 36 divisors (see below), whose sum is σ = 67940964. Its totient is φ = 5972736.

The previous prime is 22397927. The next prime is 22397951. The reversal of 22397940 is 4979322.

It can be written as a sum of positive squares in 2 ways, for example, as 16695396 + 5702544 = 4086^2 + 2388^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 = 22397895 and 22397904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62037 + ... + 62396.

It is an arithmetic number, because the mean of its divisors is an integer number (1887249).

Almost surely, 2^22397940 is an apocalyptic number.

22397940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22397940 is an abundant number, since it is smaller than the sum of its proper divisors (45543024).

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

22397940 is a wasteful number, since it uses less digits than its factorization.

22397940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124448 (or 124443 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 22397940 is about 4732.6461942554. The cubic root of 22397940 is about 281.8833076871.

The spelling of 22397940 in words is "twenty-two million, three hundred ninety-seven thousand, nine hundred forty".