121906765 has 16 divisors (see below), whose sum is σ = 147841200. Its totient is φ = 96497152.

The previous prime is 121906721. The next prime is 121906769. The reversal of 121906765 is 567609121.

It can be written as a sum of positive squares in 8 ways, for example, as 42536484 + 79370281 = 6522^2 + 8909^2 .

It is a cyclic number.

It is not a de Polignac number, because 121906765 - 2⁷ = 121906637 is a prime.

It is a super-2 number, since 2×121906765² = 29722518705530450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121906769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 313191 + ... + 313579.

It is an arithmetic number, because the mean of its divisors is an integer number (9240075).

Almost surely, 2^121906765 is an apocalyptic number.

It is an amenable number.

121906765 is a deficient number, since it is larger than the sum of its proper divisors (25934435).

121906765 is a wasteful number, since it uses less digits than its factorization.

121906765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 121906765 is about 11041.1396603793. The cubic root of 121906765 is about 495.8411911912.

The spelling of 121906765 in words is "one hundred twenty-one million, nine hundred six thousand, seven hundred sixty-five".