6420407129 has 16 divisors (see below), whose sum is σ = 6742642176. Its totient is φ = 6106334400.

The previous prime is 6420407113. The next prime is 6420407131. The reversal of 6420407129 is 9217040246.

It is a cyclic number.

It is not a de Polignac number, because 6420407129 - 2⁴ = 6420407113 is a prime.

It is a super-2 number, since 2×6420407129² = 82443255404228045282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6420407029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1791119 + ... + 1794699.

It is an arithmetic number, because the mean of its divisors is an integer number (421415136).

Almost surely, 2^6420407129 is an apocalyptic number.

It is an amenable number.

6420407129 is a deficient number, since it is larger than the sum of its proper divisors (322235047).

6420407129 is a wasteful number, since it uses less digits than its factorization.

6420407129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4696.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 6420407129 is about 80127.4430454386. The cubic root of 6420407129 is about 1858.6068043470.

The spelling of 6420407129 in words is "six billion, four hundred twenty million, four hundred seven thousand, one hundred twenty-nine".