420129999 has 18 divisors (see below), whose sum is σ = 616106400. Its totient is φ = 275879736.

The previous prime is 420129967. The next prime is 420130001. The reversal of 420129999 is 999921024.

It is not a de Polignac number, because 420129999 - 2⁵ = 420129967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420129499) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 35202 + ... + 45600.

Almost surely, 2^420129999 is an apocalyptic number.

420129999 is a deficient number, since it is larger than the sum of its proper divisors (195976401).

420129999 is a wasteful number, since it uses less digits than its factorization.

420129999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10539 (or 10469 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 420129999 is about 20497.0729373733. The cubic root of 420129999 is about 748.9644963008.

The spelling of 420129999 in words is "four hundred twenty million, one hundred twenty-nine thousand, nine hundred ninety-nine".