121839560 has 16 divisors (see below), whose sum is σ = 274139100. Its totient is φ = 48735808.

The previous prime is 121839551. The next prime is 121839569. The reversal of 121839560 is 65938121.

It is an interprime number because it is at equal distance from previous prime (121839551) and next prime (121839569).

It can be written as a sum of positive squares in 2 ways, for example, as 121837444 + 2116 = 11038^2 + 46^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121839560.

It is not an unprimeable number, because it can be changed into a prime (121839569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1522955 + ... + 1523034.

Almost surely, 2^121839560 is an apocalyptic number.

121839560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121839560 is an abundant number, since it is smaller than the sum of its proper divisors (152299540).

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

121839560 is a wasteful number, since it uses less digits than its factorization.

121839560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3046000 (or 3045996 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 121839560 is about 11038.0958502814. The cubic root of 121839560 is about 495.7500583418.

The spelling of 121839560 in words is "one hundred twenty-one million, eight hundred thirty-nine thousand, five hundred sixty".