420666739 has 2 divisors, whose sum is σ = 420666740. Its totient is φ = 420666738.

The previous prime is 420666703. The next prime is 420666767. The reversal of 420666739 is 937666024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420666739 - 2⁷ = 420666611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420666695 and 420666704.

It is not a weakly prime, because it can be changed into another prime (420666769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210333369 + 210333370.

It is an arithmetic number, because the mean of its divisors is an integer number (210333370).

Almost surely, 2^420666739 is an apocalyptic number.

420666739 is a deficient number, since it is larger than the sum of its proper divisors (1).

420666739 is an equidigital number, since it uses as much as digits as its factorization.

420666739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 43.

The square root of 420666739 is about 20510.1618472405. The cubic root of 420666739 is about 749.2833088380.

The spelling of 420666739 in words is "four hundred twenty million, six hundred sixty-six thousand, seven hundred thirty-nine".