121673639 has 4 divisors (see below), whose sum is σ = 122353560. Its totient is φ = 120993720.

The previous prime is 121673633. The next prime is 121673653. The reversal of 121673639 is 936376121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121673639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121673633) 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, 339692 + ... + 340049.

It is an arithmetic number, because the mean of its divisors is an integer number (30588390).

Almost surely, 2^121673639 is an apocalyptic number.

121673639 is a deficient number, since it is larger than the sum of its proper divisors (679921).

121673639 is an equidigital number, since it uses as much as digits as its factorization.

121673639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679920.

The product of its digits is 40824, while the sum is 38.

The square root of 121673639 is about 11030.5774554191. The cubic root of 121673639 is about 495.5249187890.

The spelling of 121673639 in words is "one hundred twenty-one million, six hundred seventy-three thousand, six hundred thirty-nine".