420517667 has 2 divisors, whose sum is σ = 420517668. Its totient is φ = 420517666.

The previous prime is 420517639. The next prime is 420517679. The reversal of 420517667 is 766715024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420517667 - 2¹² = 420513571 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420517667.

It is not a weakly prime, because it can be changed into another prime (420517267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210258833 + 210258834.

It is an arithmetic number, because the mean of its divisors is an integer number (210258834).

Almost surely, 2^420517667 is an apocalyptic number.

420517667 is a deficient number, since it is larger than the sum of its proper divisors (1).

420517667 is an equidigital number, since it uses as much as digits as its factorization.

420517667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 420517667 is about 20506.5274242130. The cubic root of 420517667 is about 749.1947903444.

The spelling of 420517667 in words is "four hundred twenty million, five hundred seventeen thousand, six hundred sixty-seven".