123400388 has 12 divisors (see below), whose sum is σ = 219611280. Its totient is φ = 60654312.

The previous prime is 123400379. The next prime is 123400391. The reversal of 123400388 is 883004321.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 123400388.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261206 + ... + 261677.

It is an arithmetic number, because the mean of its divisors is an integer number (18300940).

Almost surely, 2^123400388 is an apocalyptic number.

It is an amenable number.

123400388 is a deficient number, since it is larger than the sum of its proper divisors (96210892).

123400388 is a wasteful number, since it uses less digits than its factorization.

123400388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522946 (or 522944 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 123400388 is about 11108.5727256025. The cubic root of 123400388 is about 497.8580209550.

The spelling of 123400388 in words is "one hundred twenty-three million, four hundred thousand, three hundred eighty-eight".