123742920 has 128 divisors (see below), whose sum is σ = 434730240. Its totient is φ = 27586560.

The previous prime is 123742909. The next prime is 123742933. The reversal of 123742920 is 29247321.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32644 + ... + 36236.

It is an arithmetic number, because the mean of its divisors is an integer number (3396330).

Almost surely, 2^123742920 is an apocalyptic number.

123742920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123742920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217365120).

123742920 is an abundant number, since it is smaller than the sum of its proper divisors (310987320).

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

123742920 is a wasteful number, since it uses less digits than its factorization.

123742920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3655 (or 3651 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 123742920 is about 11123.9795037567. The cubic root of 123742920 is about 498.3182430626.

The spelling of 123742920 in words is "one hundred twenty-three million, seven hundred forty-two thousand, nine hundred twenty".