121007839 has 4 divisors (see below), whose sum is σ = 121031856. Its totient is φ = 120983824.

The previous prime is 121007833. The next prime is 121007869. The reversal of 121007839 is 938700121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938700121 = 47 ⋅19972343.

It is a cyclic number.

It is not a de Polignac number, because 121007839 - 2¹¹ = 121005791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121007839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121007833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1219 + ... + 15604.

It is an arithmetic number, because the mean of its divisors is an integer number (30257964).

Almost surely, 2^121007839 is an apocalyptic number.

121007839 is a deficient number, since it is larger than the sum of its proper divisors (24017).

121007839 is an equidigital number, since it uses as much as digits as its factorization.

121007839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24016.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 121007839 is about 11000.3563124110. The cubic root of 121007839 is about 494.6194251905.

The spelling of 121007839 in words is "one hundred twenty-one million, seven thousand, eight hundred thirty-nine".