123775890 has 32 divisors (see below), whose sum is σ = 339500160. Its totient is φ = 28291584.

The previous prime is 123775877. The next prime is 123775907. The reversal of 123775890 is 98577321.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294495 + ... + 294914.

It is an arithmetic number, because the mean of its divisors is an integer number (10609380).

Almost surely, 2^123775890 is an apocalyptic number.

123775890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123775890 is an abundant number, since it is smaller than the sum of its proper divisors (215724270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123775890 is a wasteful number, since it uses less digits than its factorization.

123775890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589426.

The product of its (nonzero) digits is 105840, while the sum is 42.

The square root of 123775890 is about 11125.4613387491. The cubic root of 123775890 is about 498.3624963514.

The spelling of 123775890 in words is "one hundred twenty-three million, seven hundred seventy-five thousand, eight hundred ninety".