6429905 has 4 divisors (see below), whose sum is σ = 7715892. Its totient is φ = 5143920.

The previous prime is 6429887. The next prime is 6429931. The reversal of 6429905 is 5099246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5099246 = 2 ⋅2549623.

It can be written as a sum of positive squares in 2 ways, for example, as 5121169 + 1308736 = 2263^2 + 1144^2 .

It is not a de Polignac number, because 6429905 - 2⁸ = 6429649 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642986 + ... + 642995.

It is an arithmetic number, because the mean of its divisors is an integer number (1928973).

Almost surely, 2^6429905 is an apocalyptic number.

It is an amenable number.

6429905 is a deficient number, since it is larger than the sum of its proper divisors (1285987).

6429905 is a wasteful number, since it uses less digits than its factorization.

6429905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285986.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 6429905 is about 2535.7257343806. The cubic root of 6429905 is about 185.9522847505.

The spelling of 6429905 in words is "six million, four hundred twenty-nine thousand, nine hundred five".