12421739 has 12 divisors (see below), whose sum is σ = 13741560. Its totient is φ = 11220000.

The previous prime is 12421727. The next prime is 12421757. The reversal of 12421739 is 93712421.

12421739 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-12421739 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (12421709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30167 + ... + 30575.

It is an arithmetic number, because the mean of its divisors is an integer number (1145130).

Almost surely, 2^12421739 is an apocalyptic number.

12421739 is a deficient number, since it is larger than the sum of its proper divisors (1319821).

12421739 is a wasteful number, since it uses less digits than its factorization.

12421739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682 (or 671 counting only the distinct ones).

The product of its digits is 3024, while the sum is 29.

The square root of 12421739 is about 3524.4487512234. The cubic root of 12421739 is about 231.5940868392.

The spelling of 12421739 in words is "twelve million, four hundred twenty-one thousand, seven hundred thirty-nine".