123400389 has 16 divisors (see below), whose sum is σ = 188762112. Its totient is φ = 70243248.

The previous prime is 123400379. The next prime is 123400391. The reversal of 123400389 is 983004321.

It is not a de Polignac number, because 123400389 - 2⁴ = 123400373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123400379) 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, 5649 + ... + 16694.

It is an arithmetic number, because the mean of its divisors is an integer number (11797632).

Almost surely, 2^123400389 is an apocalyptic number.

It is an amenable number.

123400389 is a deficient number, since it is larger than the sum of its proper divisors (65361723).

123400389 is a wasteful number, since it uses less digits than its factorization.

123400389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22616.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 123400389 is about 11108.5727706128. The cubic root of 123400389 is about 497.8580222998.

The spelling of 123400389 in words is "one hundred twenty-three million, four hundred thousand, three hundred eighty-nine".