121406720 has 36 divisors (see below), whose sum is σ = 290810100. Its totient is φ = 48562176.

The previous prime is 121406693. The next prime is 121406743. The reversal of 121406720 is 27604121.

It can be written as a sum of positive squares in 2 ways, for example, as 21086464 + 100320256 = 4592^2 + 10016^2 .

It is a super-3 number, since 3×121406720³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46145 + ... + 48704.

Almost surely, 2^121406720 is an apocalyptic number.

121406720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121406720 is an abundant number, since it is smaller than the sum of its proper divisors (169403380).

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

121406720 is an frugal number, since it uses more digits than its factorization.

121406720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94870 (or 94856 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 121406720 is about 11018.4717633617. The cubic root of 121406720 is about 495.1623043592.

The spelling of 121406720 in words is "one hundred twenty-one million, four hundred six thousand, seven hundred twenty".