121837939 has 4 divisors (see below), whose sum is σ = 121877280. Its totient is φ = 121798600.

The previous prime is 121837931. The next prime is 121837957. The reversal of 121837939 is 939738121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121837939 - 2³ = 121837931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121837895 and 121837904.

It is not an unprimeable number, because it can be changed into a prime (121837931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14587 + ... + 21364.

It is an arithmetic number, because the mean of its divisors is an integer number (30469320).

Almost surely, 2^121837939 is an apocalyptic number.

121837939 is a deficient number, since it is larger than the sum of its proper divisors (39341).

121837939 is an equidigital number, since it uses as much as digits as its factorization.

121837939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39340.

The product of its digits is 81648, while the sum is 43.

The square root of 121837939 is about 11038.0224225175. The cubic root of 121837939 is about 495.7478597827.

The spelling of 121837939 in words is "one hundred twenty-one million, eight hundred thirty-seven thousand, nine hundred thirty-nine".