8420039723 has 2 divisors, whose sum is σ = 8420039724. Its totient is φ = 8420039722.

The previous prime is 8420039689. The next prime is 8420039737. The reversal of 8420039723 is 3279300248.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8420039723 - 2¹⁰ = 8420038699 is a prime.

It is not a weakly prime, because it can be changed into another prime (8420039323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210019861 + 4210019862.

It is an arithmetic number, because the mean of its divisors is an integer number (4210019862).

Almost surely, 2^8420039723 is an apocalyptic number.

8420039723 is a deficient number, since it is larger than the sum of its proper divisors (1).

8420039723 is an equidigital number, since it uses as much as digits as its factorization.

8420039723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 8420039723 is about 91760.7744245873. The cubic root of 8420039723 is about 2034.4079616819.

The spelling of 8420039723 in words is "eight billion, four hundred twenty million, thirty-nine thousand, seven hundred twenty-three".