Search a number
-
+
261868 = 22173851
BaseRepresentation
bin111111111011101100
3111022012211
4333323230
531334433
65340204
72140315
oct777354
9438184
10261868
11169822
12107664
1392269
146b60c
15528cd
hex3feec

261868 has 12 divisors (see below), whose sum is σ = 485352. Its totient is φ = 123200.

The previous prime is 261847. The next prime is 261881. The reversal of 261868 is 868162.

It is an unprimeable number.

261868 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 3 ways as a sum of consecutive naturals, for example, 1858 + ... + 1993.

It is an arithmetic number, because the mean of its divisors is an integer number (40446).

2261868 is an apocalyptic number.

It is an amenable number.

261868 is a deficient number, since it is larger than the sum of its proper divisors (223484).

261868 is a wasteful number, since it uses less digits than its factorization.

261868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872 (or 3870 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 261868 is about 511.7303977682. The cubic root of 261868 is about 63.9775311752.

The spelling of 261868 in words is "two hundred sixty-one thousand, eight hundred sixty-eight".

Divisors: 1 2 4 17 34 68 3851 7702 15404 65467 130934 261868