121889739 has 4 divisors (see below), whose sum is σ = 162519656. Its totient is φ = 81259824.

The previous prime is 121889707. The next prime is 121889741. The reversal of 121889739 is 937988121.

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

It is not a de Polignac number, because 121889739 - 2⁵ = 121889707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121889759) 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, 20314954 + ... + 20314959.

It is an arithmetic number, because the mean of its divisors is an integer number (40629914).

Almost surely, 2^121889739 is an apocalyptic number.

121889739 is a deficient number, since it is larger than the sum of its proper divisors (40629917).

121889739 is an equidigital number, since it uses as much as digits as its factorization.

121889739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40629916.

The product of its digits is 217728, while the sum is 48.

The square root of 121889739 is about 11040.3686079768. The cubic root of 121889739 is about 495.8181063767.

The spelling of 121889739 in words is "one hundred twenty-one million, eight hundred eighty-nine thousand, seven hundred thirty-nine".