123911280 has 120 divisors (see below), whose sum is σ = 420093648. Its totient is φ = 32729088.

The previous prime is 123911273. The next prime is 123911299. The reversal of 123911280 is 82119321.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×123911280² = 30708010622476800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80599 + ... + 82121.

Almost surely, 2^123911280 is an apocalyptic number.

123911280 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 123911280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210046824).

123911280 is an abundant number, since it is smaller than the sum of its proper divisors (296182368).

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

123911280 is a wasteful number, since it uses less digits than its factorization.

123911280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655 (or 1646 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 123911280 is about 11131.5443672475. The cubic root of 123911280 is about 498.5441383816.

The spelling of 123911280 in words is "one hundred twenty-three million, nine hundred eleven thousand, two hundred eighty".