2731806 has 96 divisors (see below), whose sum is σ = 7757568. Its totient is φ = 699840.

The previous prime is 2731787. The next prime is 2731819. The reversal of 2731806 is 6081372.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 2731806.

It is a congruent 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 47 ways as a sum of consecutive naturals, for example, 37386 + ... + 37458.

It is an arithmetic number, because the mean of its divisors is an integer number (80808).

2^2731806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2731806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3878784).

2731806 is an abundant number, since it is smaller than the sum of its proper divisors (5025762).

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

2731806 is a wasteful number, since it uses less digits than its factorization.

2731806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 2731806 is about 1652.8175942916. The cubic root of 2731806 is about 139.7923110951.

The spelling of 2731806 in words is "two million, seven hundred thirty-one thousand, eight hundred six".