123090840 has 80 divisors (see below), whose sum is σ = 413732880. Its totient is φ = 32823360.

The previous prime is 123090817. The next prime is 123090841. The reversal of 123090840 is 48090321.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123090841) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15756 + ... + 22235.

It is an arithmetic number, because the mean of its divisors is an integer number (5171661).

Almost surely, 2^123090840 is an apocalyptic number.

123090840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123090840 is an abundant number, since it is smaller than the sum of its proper divisors (290642040).

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

123090840 is a wasteful number, since it uses less digits than its factorization.

123090840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38014 (or 38001 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 123090840 is about 11094.6311340215. The cubic root of 123090840 is about 497.4413826209.

The spelling of 123090840 in words is "one hundred twenty-three million, ninety thousand, eight hundred forty".