2779861 has 8 divisors (see below), whose sum is σ = 3200960. Its totient is φ = 2364768.

The previous prime is 2779859. The next prime is 2779873. The reversal of 2779861 is 1689772.

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

It is not a de Polignac number, because 2779861 - 2¹ = 2779859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2779811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456 + ... + 2401.

It is an arithmetic number, because the mean of its divisors is an integer number (400120).

2^2779861 is an apocalyptic number.

It is an amenable number.

2779861 is a deficient number, since it is larger than the sum of its proper divisors (421099).

2779861 is a wasteful number, since it uses less digits than its factorization.

2779861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003.

The product of its digits is 42336, while the sum is 40.

The square root of 2779861 is about 1667.2915162023. The cubic root of 2779861 is about 140.6072432559.

The spelling of 2779861 in words is "two million, seven hundred seventy-nine thousand, eight hundred sixty-one".