2079781 has 8 divisors (see below), whose sum is σ = 2322144. Its totient is φ = 1846320.

The previous prime is 2079769. The next prime is 2079787. The reversal of 2079781 is 1879702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2079781 - 2⁷ = 2079653 is a prime.

It is a super-2 number, since 2×2079781² = 8650978015922, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 2079781 parts by 2039 straight cuts.

2079781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2079787) 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 7 ways as a sum of consecutive naturals, for example, 1726 + ... + 2671.

It is an arithmetic number, because the mean of its divisors is an integer number (290268).

2^2079781 is an apocalyptic number.

It is an amenable number.

2079781 is a deficient number, since it is larger than the sum of its proper divisors (242363).

2079781 is a wasteful number, since it uses less digits than its factorization.

2079781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4451.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 2079781 is about 1442.1445835976. The cubic root of 2079781 is about 127.6456057929.

The spelling of 2079781 in words is "two million, seventy-nine thousand, seven hundred eighty-one".