121866393 has 16 divisors (see below), whose sum is σ = 177647616. Its totient is φ = 73697040.

The previous prime is 121866389. The next prime is 121866401. The reversal of 121866393 is 393668121.

It is not a de Polignac number, because 121866393 - 2² = 121866389 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121866373) 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, 12280 + ... + 19862.

It is an arithmetic number, because the mean of its divisors is an integer number (11102976).

Almost surely, 2^121866393 is an apocalyptic number.

It is an amenable number.

121866393 is a deficient number, since it is larger than the sum of its proper divisors (55781223).

121866393 is a wasteful number, since it uses less digits than its factorization.

121866393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8084.

The product of its digits is 46656, while the sum is 39.

The square root of 121866393 is about 11039.3112556898. The cubic root of 121866393 is about 495.7864490534.

The spelling of 121866393 in words is "one hundred twenty-one million, eight hundred sixty-six thousand, three hundred ninety-three".