2781990 has 24 divisors (see below), whose sum is σ = 7233408. Its totient is φ = 741840.

The previous prime is 2781983. The next prime is 2781991. The reversal of 2781990 is 991872.

It is a happy number.

2781990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781991) 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 11 ways as a sum of consecutive naturals, for example, 15366 + ... + 15545.

It is an arithmetic number, because the mean of its divisors is an integer number (301392).

2^2781990 is an apocalyptic number.

2781990 is an abundant number, since it is smaller than the sum of its proper divisors (4451418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2781990 is a wasteful number, since it uses less digits than its factorization.

2781990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30924 (or 30921 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 2781990 is about 1667.9298546402. The cubic root of 2781990 is about 140.6431295145.

The spelling of 2781990 in words is "two million, seven hundred eighty-one thousand, nine hundred ninety".