121938687 has 12 divisors (see below), whose sum is σ = 189682584. Its totient is φ = 75039120.

The previous prime is 121938679. The next prime is 121938701. The reversal of 121938687 is 786839121.

It is not a de Polignac number, because 121938687 - 2³ = 121938679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121938287) 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, 520989 + ... + 521222.

It is an arithmetic number, because the mean of its divisors is an integer number (15806882).

Almost surely, 2^121938687 is an apocalyptic number.

121938687 is a deficient number, since it is larger than the sum of its proper divisors (67743897).

121938687 is a wasteful number, since it uses less digits than its factorization.

121938687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042230 (or 1042227 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 121938687 is about 11042.5851592822. The cubic root of 121938687 is about 495.8844670535.

The spelling of 121938687 in words is "one hundred twenty-one million, nine hundred thirty-eight thousand, six hundred eighty-seven".