123644987 has 8 divisors (see below), whose sum is σ = 131137440. Its totient is φ = 116328960.

The previous prime is 123644959. The next prime is 123644993. The reversal of 123644987 is 789446321.

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 123644987 - 2⁶ = 123644923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123644947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42662 + ... + 45467.

It is an arithmetic number, because the mean of its divisors is an integer number (16392180).

Almost surely, 2^123644987 is an apocalyptic number.

123644987 is a deficient number, since it is larger than the sum of its proper divisors (7492453).

123644987 is an equidigital number, since it uses as much as digits as its factorization.

123644987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88213.

The product of its digits is 290304, while the sum is 44.

The square root of 123644987 is about 11119.5767455421. The cubic root of 123644987 is about 498.1867481847.

The spelling of 123644987 in words is "one hundred twenty-three million, six hundred forty-four thousand, nine hundred eighty-seven".