123881857 has 12 divisors (see below), whose sum is σ = 136458000. Its totient is φ = 112379960.

The previous prime is 123881837. The next prime is 123881893. The reversal of 123881857 is 758188321.

It is not a de Polignac number, because 123881857 - 2²³ = 115493249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123881827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81894 + ... + 83392.

It is an arithmetic number, because the mean of its divisors is an integer number (11371500).

Almost surely, 2^123881857 is an apocalyptic number.

It is an amenable number.

123881857 is a deficient number, since it is larger than the sum of its proper divisors (12576143).

123881857 is a wasteful number, since it uses less digits than its factorization.

123881857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2204 (or 2193 counting only the distinct ones).

The product of its digits is 107520, while the sum is 43.

The square root of 123881857 is about 11130.2226842054. Note that the first 3 decimals coincide. The cubic root of 123881857 is about 498.5046751318.

It can be divided in two parts, 1238 and 81857, that multiplied together give a triangular number (101338966 = T₁₄₂₃₆).

The spelling of 123881857 in words is "one hundred twenty-three million, eight hundred eighty-one thousand, eight hundred fifty-seven".