121662765 has 48 divisors (see below), whose sum is σ = 244108800. Its totient is φ = 54902016.

The previous prime is 121662763. The next prime is 121662767. The reversal of 121662765 is 567266121.

It is a happy number.

121662765 is a `hidden beast` number, since 1 + 21 + 6 + 627 + 6 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (121662763) and next prime (121662767).

It is not a de Polignac number, because 121662765 - 2¹ = 121662763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121662763) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 22441 + ... + 27329.

It is an arithmetic number, because the mean of its divisors is an integer number (5085600).

Almost surely, 2^121662765 is an apocalyptic number.

121662765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121662765 is an abundant number, since it is smaller than the sum of its proper divisors (122446035).

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

121662765 is a wasteful number, since it uses less digits than its factorization.

121662765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4986 (or 4983 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 121662765 is about 11030.0845418338. The cubic root of 121662765 is about 495.5101566254.

The spelling of 121662765 in words is "one hundred twenty-one million, six hundred sixty-two thousand, seven hundred sixty-five".