123857890 has 16 divisors (see below), whose sum is σ = 240094008. Its totient is φ = 45732096.

The previous prime is 123857863. The next prime is 123857891. The reversal of 123857890 is 98758321.

It can be written as a sum of positive squares in 4 ways, for example, as 92486689 + 31371201 = 9617^2 + 5601^2 .

It is not an unprimeable number, because it can be changed into a prime (123857891) 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, 476247 + ... + 476506.

Almost surely, 2^123857890 is an apocalyptic number.

123857890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123857890 is a deficient number, since it is larger than the sum of its proper divisors (116236118).

123857890 is a wasteful number, since it uses less digits than its factorization.

123857890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952773.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 123857890 is about 11129.1459690310. The cubic root of 123857890 is about 498.4725250591.

The spelling of 123857890 in words is "one hundred twenty-three million, eight hundred fifty-seven thousand, eight hundred ninety".