420402517 has 2 divisors, whose sum is σ = 420402518. Its totient is φ = 420402516.

The previous prime is 420402509. The next prime is 420402539. The reversal of 420402517 is 715204024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 381577156 + 38825361 = 19534^2 + 6231^2 .

It is a cyclic number.

It is not a de Polignac number, because 420402517 - 2³ = 420402509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420402491 and 420402500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420402557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210201258 + 210201259.

It is an arithmetic number, because the mean of its divisors is an integer number (210201259).

Almost surely, 2^420402517 is an apocalyptic number.

It is an amenable number.

420402517 is a deficient number, since it is larger than the sum of its proper divisors (1).

420402517 is an equidigital number, since it uses as much as digits as its factorization.

420402517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 420402517 is about 20503.7195893818. The cubic root of 420402517 is about 749.1264003080.

The spelling of 420402517 in words is "four hundred twenty million, four hundred two thousand, five hundred seventeen".