121687923 has 12 divisors (see below), whose sum is σ = 188740680. Its totient is φ = 69535872.

The previous prime is 121687873. The next prime is 121687939. The reversal of 121687923 is 329786121.

It is not a de Polignac number, because 121687923 - 2⁶ = 121687859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121647923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 413758 + ... + 414051.

It is an arithmetic number, because the mean of its divisors is an integer number (15728390).

Almost surely, 2^121687923 is an apocalyptic number.

121687923 is a deficient number, since it is larger than the sum of its proper divisors (67052757).

121687923 is an equidigital number, since it uses as much as digits as its factorization.

121687923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827826 (or 827819 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 121687923 is about 11031.2249093199. The cubic root of 121687923 is about 495.5443089134.

The spelling of 121687923 in words is "one hundred twenty-one million, six hundred eighty-seven thousand, nine hundred twenty-three".