123557887 has 16 divisors (see below), whose sum is σ = 134719200. Its totient is φ = 112860160.

The previous prime is 123557881. The next prime is 123557891. The reversal of 123557887 is 788755321.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123557887 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 (123557881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187164 + ... + 187822.

It is an arithmetic number, because the mean of its divisors is an integer number (8419950).

Almost surely, 2^123557887 is an apocalyptic number.

123557887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

123557887 is a deficient number, since it is larger than the sum of its proper divisors (11161313).

123557887 is a wasteful number, since it uses less digits than its factorization.

123557887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986.

The product of its digits is 470400, while the sum is 46.

The square root of 123557887 is about 11115.6595395865. The cubic root of 123557887 is about 498.0697404521.

The spelling of 123557887 in words is "one hundred twenty-three million, five hundred fifty-seven thousand, eight hundred eighty-seven".