121640393 has 12 divisors (see below), whose sum is σ = 142053120. Its totient is φ = 103855752.

The previous prime is 121640383. The next prime is 121640437. The reversal of 121640393 is 393046121.

It is not a de Polignac number, because 121640393 - 2⁴ = 121640377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121640383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8168 + ... + 17606.

It is an arithmetic number, because the mean of its divisors is an integer number (11837760).

Almost surely, 2^121640393 is an apocalyptic number.

It is an amenable number.

121640393 is a deficient number, since it is larger than the sum of its proper divisors (20412727).

121640393 is an equidigital number, since it uses as much as digits as its factorization.

121640393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9716 (or 9709 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 121640393 is about 11029.0703597357. The cubic root of 121640393 is about 495.4797824109.

The spelling of 121640393 in words is "one hundred twenty-one million, six hundred forty thousand, three hundred ninety-three".