123977872 has 40 divisors (see below), whose sum is σ = 258170976. Its totient is φ = 57463296.

The previous prime is 123977851. The next prime is 123977873. The reversal of 123977872 is 278779321.

It is a happy number.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (123977873) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14823 + ... + 21625.

Almost surely, 2^123977872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123977872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129085488).

123977872 is an abundant number, since it is smaller than the sum of its proper divisors (134193104).

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

123977872 is a wasteful number, since it uses less digits than its factorization.

123977872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6895 (or 6889 counting only the distinct ones).

The product of its digits is 296352, while the sum is 46.

The square root of 123977872 is about 11134.5351047989. The cubic root of 123977872 is about 498.6334310480.

The spelling of 123977872 in words is "one hundred twenty-three million, nine hundred seventy-seven thousand, eight hundred seventy-two".