8420739 has 4 divisors (see below), whose sum is σ = 11227656. Its totient is φ = 5613824.

The previous prime is 8420681. The next prime is 8420749. The reversal of 8420739 is 9370248.

8420739 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8420739 - 2⁸ = 8420483 is a prime.

It is a super-2 number, since 2×8420739² = 141817690612242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8420749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1403454 + ... + 1403459.

It is an arithmetic number, because the mean of its divisors is an integer number (2806914).

Almost surely, 2^8420739 is an apocalyptic number.

8420739 is a deficient number, since it is larger than the sum of its proper divisors (2806917).

8420739 is a wasteful number, since it uses less digits than its factorization.

8420739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806916.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 8420739 is about 2901.8509610247. The cubic root of 8420739 is about 203.4464278729.

The spelling of 8420739 in words is "eight million, four hundred twenty thousand, seven hundred thirty-nine".