2780986 has 8 divisors (see below), whose sum is σ = 4492404. Its totient is φ = 1283520.

The previous prime is 2780971. The next prime is 2780993. The reversal of 2780986 is 6890872.

It can be written as a sum of positive squares in 2 ways, for example, as 2461761 + 319225 = 1569^2 + 565^2 .

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

It is an Ulam number.

It is an unprimeable number.

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, 53455 + ... + 53506.

2^2780986 is an apocalyptic number.

2780986 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2780986 is a deficient number, since it is larger than the sum of its proper divisors (1711418).

2780986 is a wasteful number, since it uses less digits than its factorization.

2780986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106976.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 2780986 is about 1667.6288555911. The cubic root of 2780986 is about 140.6262084505.

The spelling of 2780986 in words is "two million, seven hundred eighty thousand, nine hundred eighty-six".