2731890 has 32 divisors (see below), whose sum is σ = 7493760. Its totient is φ = 624384.

The previous prime is 2731889. The next prime is 2731901. The reversal of 2731890 is 981372.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 15 ways as a sum of consecutive naturals, for example, 6295 + ... + 6714.

It is an arithmetic number, because the mean of its divisors is an integer number (234180).

2^2731890 is an apocalyptic number.

2731890 is an abundant number, since it is smaller than the sum of its proper divisors (4761870).

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

2731890 is a wasteful number, since it uses less digits than its factorization.

2731890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13026.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 2731890 is about 1652.8430052488. The cubic root of 2731890 is about 139.7937438999.

The spelling of 2731890 in words is "two million, seven hundred thirty-one thousand, eight hundred ninety".