2779791 has 8 divisors (see below), whose sum is σ = 4235904. Its totient is φ = 1588440.

The previous prime is 2779787. The next prime is 2779793. The reversal of 2779791 is 1979772.

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

It is not a de Polignac number, because 2779791 - 2² = 2779787 is a prime.

2779791 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2779793) 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, 66165 + ... + 66206.

It is an arithmetic number, because the mean of its divisors is an integer number (529488).

2^2779791 is an apocalyptic number.

2779791 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2779791 is a deficient number, since it is larger than the sum of its proper divisors (1456113).

2779791 is a wasteful number, since it uses less digits than its factorization.

2779791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132381.

The product of its digits is 55566, while the sum is 42.

The square root of 2779791 is about 1667.2705239403. The cubic root of 2779791 is about 140.6060630303.

It can be divided in two parts, 2779 and 791, that added together give a triangular number (3570 = T₈₄).

The spelling of 2779791 in words is "two million, seven hundred seventy-nine thousand, seven hundred ninety-one".