123557889 has 32 divisors (see below), whose sum is σ = 203392000. Its totient is φ = 64971072.

The previous prime is 123557881. The next prime is 123557891. The reversal of 123557889 is 988755321.

It is not a de Polignac number, because 123557889 - 2³ = 123557881 is a prime.

It is a plaindrome in base 10.

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 31 ways as a sum of consecutive naturals, for example, 135774 + ... + 136680.

It is an arithmetic number, because the mean of its divisors is an integer number (6356000).

Almost surely, 2^123557889 is an apocalyptic number.

It is an amenable number.

123557889 is a deficient number, since it is larger than the sum of its proper divisors (79834111).

123557889 is a wasteful number, since it uses less digits than its factorization.

123557889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429.

The product of its digits is 604800, while the sum is 48.

The square root of 123557889 is about 11115.6596295497. The cubic root of 123557889 is about 498.0697431395.

The spelling of 123557889 in words is "one hundred twenty-three million, five hundred fifty-seven thousand, eight hundred eighty-nine".