22043987 has 8 divisors (see below), whose sum is σ = 25729536. Its totient is φ = 18492552.

The previous prime is 22043977. The next prime is 22043999. The reversal of 22043987 is 78934022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22043987 - 2⁸ = 22043731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22043947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33173 + ... + 33830.

It is an arithmetic number, because the mean of its divisors is an integer number (3216192).

Almost surely, 2^22043987 is an apocalyptic number.

22043987 is a deficient number, since it is larger than the sum of its proper divisors (3685549).

22043987 is an equidigital number, since it uses as much as digits as its factorization.

22043987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67057.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 22043987 is about 4695.1024482965. The cubic root of 22043987 is about 280.3905561725.

Adding to 22043987 its sum of digits (35), we get a palindrome (22044022).

The spelling of 22043987 in words is "twenty-two million, forty-three thousand, nine hundred eighty-seven".