121392720 has 60 divisors (see below), whose sum is σ = 407679636. Its totient is φ = 32371200.

The previous prime is 121392703. The next prime is 121392721. The reversal of 121392720 is 27293121.

It can be written as a sum of positive squares in 2 ways, for example, as 49617936 + 71774784 = 7044^2 + 8472^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121392721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83581 + ... + 85020.

Almost surely, 2^121392720 is an apocalyptic number.

121392720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121392720 is an abundant number, since it is smaller than the sum of its proper divisors (286286916).

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

121392720 is a wasteful number, since it uses less digits than its factorization.

121392720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168620 (or 168611 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 121392720 is about 11017.8364482325. The cubic root of 121392720 is about 495.1432704354.

The spelling of 121392720 in words is "one hundred twenty-one million, three hundred ninety-two thousand, seven hundred twenty".