12840739 has 16 divisors (see below), whose sum is σ = 14008320. Its totient is φ = 11737440.

The previous prime is 12840697. The next prime is 12840743. The reversal of 12840739 is 93704821.

It is a cyclic number.

It is not a de Polignac number, because 12840739 - 2¹¹ = 12838691 is a prime.

It is a super-2 number, since 2×12840739² = 329769156132242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12840769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67134 + ... + 67324.

It is an arithmetic number, because the mean of its divisors is an integer number (875520).

Almost surely, 2^12840739 is an apocalyptic number.

12840739 is a deficient number, since it is larger than the sum of its proper divisors (1167581).

12840739 is a wasteful number, since it uses less digits than its factorization.

12840739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 12840739 is about 3583.3976893446. The cubic root of 12840739 is about 234.1693261491.

The spelling of 12840739 in words is "twelve million, eight hundred forty thousand, seven hundred thirty-nine".