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6401905 = 54332957
BaseRepresentation
bin11000011010111101110001
3110001020202121
4120122331301
53114330110
6345114241
7105262306
oct30327561
913036677
106401905
113682934
122188981
131431c13
14bc90ad
15866cda
hex61af71

6401905 has 8 divisors (see below), whose sum is σ = 7702632. Its totient is φ = 5107968.

The previous prime is 6401893. The next prime is 6401921. The reversal of 6401905 is 5091046.

It can be written as a sum of positive squares in 4 ways, for example, as 31329 + 6370576 = 177^2 + 2524^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6401905 - 217 = 6270833 is a prime.

It is a Duffinian number.

6401905 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6401905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687 + ... + 3643.

It is an arithmetic number, because the mean of its divisors is an integer number (962829).

Almost surely, 26401905 is an apocalyptic number.

It is an amenable number.

6401905 is a deficient number, since it is larger than the sum of its proper divisors (1300727).

6401905 is a wasteful number, since it uses less digits than its factorization.

6401905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3395.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 6401905 is about 2530.1986088052. The cubic root of 6401905 is about 185.6819728228.

The spelling of 6401905 in words is "six million, four hundred one thousand, nine hundred five".

Divisors: 1 5 433 2165 2957 14785 1280381 6401905