123365780 has 24 divisors (see below), whose sum is σ = 259604352. Its totient is φ = 49244192.

The previous prime is 123365773. The next prime is 123365831. The reversal of 123365780 is 87563321.

It is a self number, because there is not a number n which added to its sum of digits gives 123365780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3929 + ... + 16191.

It is an arithmetic number, because the mean of its divisors is an integer number (10816848).

Almost surely, 2^123365780 is an apocalyptic number.

123365780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123365780 is an abundant number, since it is smaller than the sum of its proper divisors (136238572).

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

123365780 is a wasteful number, since it uses less digits than its factorization.

123365780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12775 (or 12773 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 123365780 is about 11107.0149005032. The cubic root of 123365780 is about 497.8114746903.

The spelling of 123365780 in words is "one hundred twenty-three million, three hundred sixty-five thousand, seven hundred eighty".