121607720 has 32 divisors (see below), whose sum is σ = 294666120. Its totient is φ = 44901120.

The previous prime is 121607719. The next prime is 121607723. The reversal of 121607720 is 27706121.

It can be written as a sum of positive squares in 4 ways, for example, as 105719524 + 15888196 = 10282^2 + 3986^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 121607720.

It is not an unprimeable number, because it can be changed into a prime (121607723) 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, 116411 + ... + 117450.

Almost surely, 2^121607720 is an apocalyptic number.

121607720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121607720 is an abundant number, since it is smaller than the sum of its proper divisors (173058400).

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

121607720 is a wasteful number, since it uses less digits than its factorization.

121607720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233885 (or 233881 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 121607720 is about 11027.5890384073. The cubic root of 121607720 is about 495.4354159517.

The spelling of 121607720 in words is "one hundred twenty-one million, six hundred seven thousand, seven hundred twenty".