420161005 has 12 divisors (see below), whose sum is σ = 554196636. Its totient is φ = 305571200.

The previous prime is 420160963. The next prime is 420161017. The reversal of 420161005 is 500161024.

It can be written as a sum of positive squares in 2 ways, for example, as 243297604 + 176863401 = 15598^2 + 13299^2 .

It is not a de Polignac number, because 420161005 - 2⁷ = 420160877 is a prime.

It is a super-2 number, since 2×420161005² = 353070540245220050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346636 + ... + 347845.

It is an arithmetic number, because the mean of its divisors is an integer number (46183053).

Almost surely, 2^420161005 is an apocalyptic number.

It is an amenable number.

420161005 is a deficient number, since it is larger than the sum of its proper divisors (134035631).

420161005 is a wasteful number, since it uses less digits than its factorization.

420161005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694508 (or 694497 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 420161005 is about 20497.8292753160. The cubic root of 420161005 is about 748.9829206154.

Adding to 420161005 its sum of digits (19), we get a palindrome (420161024).

The spelling of 420161005 in words is "four hundred twenty million, one hundred sixty-one thousand, five".