12121839 has 16 divisors (see below), whose sum is σ = 18188800. Its totient is φ = 7977528.

The previous prime is 12121831. The next prime is 12121871. The reversal of 12121839 is 93812121.

12121839 = T₅₁₄ + T₅₁₅ + ... + T₅₉₂.

It is not a de Polignac number, because 12121839 - 2³ = 12121831 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 709 + ... + 4974.

It is an arithmetic number, because the mean of its divisors is an integer number (1136800).

Almost surely, 2^12121839 is an apocalyptic number.

12121839 is a deficient number, since it is larger than the sum of its proper divisors (6066961).

12121839 is an equidigital number, since it uses as much as digits as its factorization.

12121839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5771 (or 5765 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 12121839 is about 3481.6431465617. The cubic root of 12121839 is about 229.7150788209.

The spelling of 12121839 in words is "twelve million, one hundred twenty-one thousand, eight hundred thirty-nine".