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641406 = 23532017
BaseRepresentation
bin10011100100101111110
31012120211210
42130211332
5131011111
621425250
75310663
oct2344576
91176753
10641406
113a8997
1226b226
13195c3c
14129a6a
15ca0a6
hex9c97e

641406 has 16 divisors (see below), whose sum is σ = 1307664. Its totient is φ = 209664.

The previous prime is 641387. The next prime is 641411. The reversal of 641406 is 604146.

It is a super-2 number, since 2×6414062 = 822803313672, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 641406.

It is an unprimeable number.

641406 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691 + ... + 1326.

It is an arithmetic number, because the mean of its divisors is an integer number (81729).

2641406 is an apocalyptic number.

641406 is an abundant number, since it is smaller than the sum of its proper divisors (666258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641406 is a wasteful number, since it uses less digits than its factorization.

641406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 641406 is about 800.8782679034. The cubic root of 641406 is about 86.2404484277.

It can be divided in two parts, 64140 and 6, that added together give a palindrome (64146).

The spelling of 641406 in words is "six hundred forty-one thousand, four hundred six".

Divisors: 1 2 3 6 53 106 159 318 2017 4034 6051 12102 106901 213802 320703 641406