22401556 has 12 divisors (see below), whose sum is σ = 39699520. Its totient is φ = 11058840.

The previous prime is 22401541. The next prime is 22401559. The reversal of 22401556 is 65510422.

It is a super-2 number, since 2×22401556² = 1003659422442272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22401556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22401559) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 35130 + ... + 35761.

Almost surely, 2^22401556 is an apocalyptic number.

It is an amenable number.

22401556 is a deficient number, since it is larger than the sum of its proper divisors (17297964).

22401556 is a wasteful number, since it uses less digits than its factorization.

22401556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70974 (or 70972 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 22401556 is about 4733.0282061277. The cubic root of 22401556 is about 281.8984762724.

Adding to 22401556 its reverse (65510422), we get a palindrome (87911978).

The spelling of 22401556 in words is "twenty-two million, four hundred one thousand, five hundred fifty-six".