123400940 has 24 divisors (see below), whose sum is σ = 279076560. Its totient is φ = 45563328.

The previous prime is 123400889. The next prime is 123400973. The reversal of 123400940 is 49004321.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237050 + ... + 237569.

It is an arithmetic number, because the mean of its divisors is an integer number (11628190).

Almost surely, 2^123400940 is an apocalyptic number.

123400940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123400940 is an abundant number, since it is smaller than the sum of its proper divisors (155675620).

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

123400940 is a wasteful number, since it uses less digits than its factorization.

123400940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474641 (or 474639 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 123400940 is about 11108.5975712508. The cubic root of 123400940 is about 497.8587633006.

The spelling of 123400940 in words is "one hundred twenty-three million, four hundred thousand, nine hundred forty".