420061639 has 2 divisors, whose sum is σ = 420061640. Its totient is φ = 420061638.

The previous prime is 420061601. The next prime is 420061657. The reversal of 420061639 is 936160024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420061639 - 2⁷ = 420061511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420061639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420061679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210030819 + 210030820.

It is an arithmetic number, because the mean of its divisors is an integer number (210030820).

Almost surely, 2^420061639 is an apocalyptic number.

420061639 is a deficient number, since it is larger than the sum of its proper divisors (1).

420061639 is an equidigital number, since it uses as much as digits as its factorization.

420061639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 420061639 is about 20495.4053143625. The cubic root of 420061639 is about 748.9238723746.

The spelling of 420061639 in words is "four hundred twenty million, sixty-one thousand, six hundred thirty-nine".