122749812 has 36 divisors (see below), whose sum is σ = 315376516. Its totient is φ = 40245120.

The previous prime is 122749807. The next prime is 122749813. The reversal of 122749812 is 218947221.

It can be written as a sum of positive squares in 2 ways, for example, as 29550096 + 93199716 = 5436^2 + 9654^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122749813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25753 + ... + 30144.

Almost surely, 2^122749812 is an apocalyptic number.

122749812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

122749812 is an abundant number, since it is smaller than the sum of its proper divisors (192626704).

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

122749812 is a wasteful number, since it uses less digits than its factorization.

122749812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55968 (or 55963 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 122749812 is about 11079.2514187557. The cubic root of 122749812 is about 496.9815640904.

The spelling of 122749812 in words is "one hundred twenty-two million, seven hundred forty-nine thousand, eight hundred twelve".