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261638 = 21329347
BaseRepresentation
bin111111111000000110
3111021220022
4333320012
531333023
65335142
72136536
oct777006
9437808
10261638
11169633
121074b2
1392120
146b4c6
15527c8
hex3fe06

261638 has 16 divisors (see below), whose sum is σ = 438480. Its totient is φ = 116256.

The previous prime is 261637. The next prime is 261641. The reversal of 261638 is 836162.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 581 + ... + 927.

It is an arithmetic number, because the mean of its divisors is an integer number (27405).

2261638 is an apocalyptic number.

261638 is a deficient number, since it is larger than the sum of its proper divisors (176842).

261638 is a wasteful number, since it uses less digits than its factorization.

261638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391.

The product of its digits is 1728, while the sum is 26.

The square root of 261638 is about 511.5056206925. The cubic root of 261638 is about 63.9587950915.

The spelling of 261638 in words is "two hundred sixty-one thousand, six hundred thirty-eight".

Divisors: 1 2 13 26 29 58 347 377 694 754 4511 9022 10063 20126 130819 261638