122780 has 24 divisors (see below), whose sum is σ = 295008. Its totient is φ = 42048.

The previous prime is 122777. The next prime is 122789. The reversal of 122780 is 87221.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299 + ... + 578.

It is an arithmetic number, because the mean of its divisors is an integer number (12292).

2¹²²⁷⁸⁰ is an apocalyptic number.

122780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122780 is an abundant number, since it is smaller than the sum of its proper divisors (172228).

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

122780 is a wasteful number, since it uses less digits than its factorization.

122780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893 (or 891 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 122780 is about 350.3997716894. The cubic root of 122780 is about 49.7022301830.

Subtracting from 122780 its sum of digits (20), we obtain a triangular number (122760 = T₄₉₅).

The spelling of 122780 in words is "one hundred twenty-two thousand, seven hundred eighty".