121802540 has 24 divisors (see below), whose sum is σ = 269248560. Its totient is φ = 46156608.

The previous prime is 121802509. The next prime is 121802573. The reversal of 121802540 is 45208121.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 159887 + ... + 160646.

It is an arithmetic number, because the mean of its divisors is an integer number (11218690).

Almost surely, 2^121802540 is an apocalyptic number.

121802540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121802540 is an abundant number, since it is smaller than the sum of its proper divisors (147446020).

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

121802540 is a wasteful number, since it uses less digits than its factorization.

121802540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320561 (or 320559 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 121802540 is about 11036.4188032169. The cubic root of 121802540 is about 495.6998433261.

The spelling of 121802540 in words is "one hundred twenty-one million, eight hundred two thousand, five hundred forty".