121699280 has 20 divisors (see below), whose sum is σ = 282951012. Its totient is φ = 48679680.

The previous prime is 121699219. The next prime is 121699301. The reversal of 121699280 is 82996121.

It can be written as a sum of positive squares in 2 ways, for example, as 30382144 + 91317136 = 5512^2 + 9556^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 760541 + ... + 760700.

Almost surely, 2^121699280 is an apocalyptic number.

121699280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121699280 is an abundant number, since it is smaller than the sum of its proper divisors (161251732).

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

121699280 is a wasteful number, since it uses less digits than its factorization.

121699280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521254 (or 1521248 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 121699280 is about 11031.7396633532. The cubic root of 121699280 is about 495.5597246356.

The spelling of 121699280 in words is "one hundred twenty-one million, six hundred ninety-nine thousand, two hundred eighty".