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2690861 = 3138597
BaseRepresentation
bin1010010000111100101101
312001201011112
422100330231
51142101421
6133401405
731605035
oct12207455
95051145
102690861
111578758
12a99265
13732a34
145008c5
1538245b
hex290f2d

2690861 has 4 divisors (see below), whose sum is σ = 2699772. Its totient is φ = 2681952.

The previous prime is 2690851. The next prime is 2690887. The reversal of 2690861 is 1680962.

2690861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 714025 + 1976836 = 845^2 + 1406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-2690861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2690851) 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 3 ways as a sum of consecutive naturals, for example, 3986 + ... + 4611.

It is an arithmetic number, because the mean of its divisors is an integer number (674943).

22690861 is an apocalyptic number.

It is an amenable number.

2690861 is a deficient number, since it is larger than the sum of its proper divisors (8911).

2690861 is an equidigital number, since it uses as much as digits as its factorization.

2690861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8910.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 2690861 is about 1640.3844061683. The cubic root of 2690861 is about 139.0903782260.

The spelling of 2690861 in words is "two million, six hundred ninety thousand, eight hundred sixty-one".

Divisors: 1 313 8597 2690861