22222540 has 36 divisors (see below), whose sum is σ = 47776176. Its totient is φ = 8682592.

The previous prime is 22222537. The next prime is 22222547. The reversal of 22222540 is 4522222.

It is not an unprimeable number, because it can be changed into a prime (22222547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43929 + ... + 44431.

It is an arithmetic number, because the mean of its divisors is an integer number (1327116).

Almost surely, 2^22222540 is an apocalyptic number.

22222540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22222540 is an abundant number, since it is smaller than the sum of its proper divisors (25553636).

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

22222540 is a wasteful number, since it uses less digits than its factorization.

22222540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606 (or 557 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 22222540 is about 4714.0789132131. The cubic root of 22222540 is about 281.1455618817.

Adding to 22222540 its reverse (4522222), we get a palindrome (26744762).

The spelling of 22222540 in words is "twenty-two million, two hundred twenty-two thousand, five hundred forty".