2439678121 has 4 divisors (see below), whose sum is σ = 2439778644. Its totient is φ = 2439577600.

The previous prime is 2439678113. The next prime is 2439678151. The reversal of 2439678121 is 1218769342.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2366336025 + 73342096 = 48645^2 + 8564^2 .

It is a cyclic number.

It is not a de Polignac number, because 2439678121 - 2³ = 2439678113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2439678151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11181 + ... + 70741.

It is an arithmetic number, because the mean of its divisors is an integer number (609944661).

Almost surely, 2^2439678121 is an apocalyptic number.

It is an amenable number.

2439678121 is a deficient number, since it is larger than the sum of its proper divisors (100523).

2439678121 is an equidigital number, since it uses as much as digits as its factorization.

2439678121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100522.

The product of its digits is 145152, while the sum is 43.

The square root of 2439678121 is about 49393.0979085135. The cubic root of 2439678121 is about 1346.2038982404.

The spelling of 2439678121 in words is "two billion, four hundred thirty-nine million, six hundred seventy-eight thousand, one hundred twenty-one".