6420129 has 8 divisors (see below), whose sum is σ = 8791680. Its totient is φ = 4164336.

The previous prime is 6420109. The next prime is 6420173. The reversal of 6420129 is 9210246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-6420129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6420099 and 6420108.

It is not an unprimeable number, because it can be changed into a prime (6420109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28809 + ... + 29030.

It is an arithmetic number, because the mean of its divisors is an integer number (1098960).

Almost surely, 2^6420129 is an apocalyptic number.

It is an amenable number.

6420129 is a deficient number, since it is larger than the sum of its proper divisors (2371551).

6420129 is a wasteful number, since it uses less digits than its factorization.

6420129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57879.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 6420129 is about 2533.7973478556. The cubic root of 6420129 is about 185.8579965970.

The spelling of 6420129 in words is "six million, four hundred twenty thousand, one hundred twenty-nine".