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1306861 = 4193119
BaseRepresentation
bin100111111000011101101
32110101200021
410333003231
5313304421
644002141
714052043
oct4770355
92411607
101306861
11812956
12530351
13369aba
14260393
151ac341
hex13f0ed

1306861 has 4 divisors (see below), whose sum is σ = 1310400. Its totient is φ = 1303324.

The previous prime is 1306853. The next prime is 1306873. The reversal of 1306861 is 1686031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1306861 - 23 = 1306853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306831) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1141 + ... + 1978.

It is an arithmetic number, because the mean of its divisors is an integer number (327600).

21306861 is an apocalyptic number.

It is an amenable number.

1306861 is a deficient number, since it is larger than the sum of its proper divisors (3539).

1306861 is an equidigital number, since it uses as much as digits as its factorization.

1306861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3538.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1306861 is about 1143.1802132647. The cubic root of 1306861 is about 109.3309527127.

The spelling of 1306861 in words is "one million, three hundred six thousand, eight hundred sixty-one".

Divisors: 1 419 3119 1306861