2091290 has 16 divisors (see below), whose sum is σ = 3790368. Its totient is φ = 830736.

The previous prime is 2091283. The next prime is 2091293. The reversal of 2091290 is 921902.

It is an Ulam number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (2091293) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 989 + ... + 2271.

It is an arithmetic number, because the mean of its divisors is an integer number (236898).

2^2091290 is an apocalyptic number.

2091290 is a deficient number, since it is larger than the sum of its proper divisors (1699078).

2091290 is a wasteful number, since it uses less digits than its factorization.

2091290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 2091290 is about 1446.1293164859. The cubic root of 2091290 is about 127.8806260100.

The spelling of 2091290 in words is "two million, ninety-one thousand, two hundred ninety".