22509987 has 8 divisors (see below), whose sum is σ = 30046800. Its totient is φ = 14989920.

The previous prime is 22509983. The next prime is 22510043. The reversal of 22509987 is 78990522.

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

It is not a de Polignac number, because 22509987 - 2² = 22509983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22509983) 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, 612 + ... + 6737.

It is an arithmetic number, because the mean of its divisors is an integer number (3755850).

Almost surely, 2^22509987 is an apocalyptic number.

22509987 is a deficient number, since it is larger than the sum of its proper divisors (7536813).

22509987 is a wasteful number, since it uses less digits than its factorization.

22509987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8373.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 22509987 is about 4744.4690956945. The cubic root of 22509987 is about 282.3525719383.

The spelling of 22509987 in words is "twenty-two million, five hundred nine thousand, nine hundred eighty-seven".