121407765 has 32 divisors (see below), whose sum is σ = 200866176. Its totient is φ = 62576640.

The previous prime is 121407709. The next prime is 121407857. The reversal of 121407765 is 567704121.

It is not a de Polignac number, because 121407765 - 2⁸ = 121407509 is a prime.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 68622 + ... + 70368.

It is an arithmetic number, because the mean of its divisors is an integer number (6277068).

Almost surely, 2^121407765 is an apocalyptic number.

121407765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121407765 is a deficient number, since it is larger than the sum of its proper divisors (79458411).

121407765 is a wasteful number, since it uses less digits than its factorization.

121407765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 121407765 is about 11018.5191836290. The cubic root of 121407765 is about 495.1637250469.

The spelling of 121407765 in words is "one hundred twenty-one million, four hundred seven thousand, seven hundred sixty-five".