123879240 has 128 divisors (see below), whose sum is σ = 434736000. Its totient is φ = 31290624.

The previous prime is 123879211. The next prime is 123879241. The reversal of 123879240 is 42978321.

It is a super-2 number, since 2×123879240² = 30692132205955200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 123879195 and 123879204.

It is not an unprimeable number, because it can be changed into a prime (123879241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17502 + ... + 23538.

It is an arithmetic number, because the mean of its divisors is an integer number (3396375).

Almost surely, 2^123879240 is an apocalyptic number.

123879240 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 123879240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217368000).

123879240 is an abundant number, since it is smaller than the sum of its proper divisors (310856760).

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

123879240 is a wasteful number, since it uses less digits than its factorization.

123879240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6076 (or 6066 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 123879240 is about 11130.1051207974. The cubic root of 123879240 is about 498.5011648090.

The spelling of 123879240 in words is "one hundred twenty-three million, eight hundred seventy-nine thousand, two hundred forty".