123887987999 has 8 divisors (see below), whose sum is σ = 130968105840. Its totient is φ = 116863839936.

The previous prime is 123887987987. The next prime is 123887988031. The reversal of 123887987999 is 999789788321.

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 123887987999 - 2²⁴ = 123871210783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123887987959) 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, 13987892 + ... + 13996745.

It is an arithmetic number, because the mean of its divisors is an integer number (16371013230).

Almost surely, 2^123887987999 is an apocalyptic number.

123887987999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

123887987999 is a deficient number, since it is larger than the sum of its proper divisors (7080117841).

123887987999 is a wasteful number, since it uses less digits than its factorization.

123887987999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27984889.

The product of its digits is 987614208, while the sum is 80.

The spelling of 123887987999 in words is "one hundred twenty-three billion, eight hundred eighty-seven million, nine hundred eighty-seven thousand, nine hundred ninety-nine".