2091738 has 32 divisors (see below), whose sum is σ = 4681152. Its totient is φ = 617600.

The previous prime is 2091737. The next prime is 2091763. The reversal of 2091738 is 8371902.

It is a happy number.

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2320 + ... + 3092.

It is an arithmetic number, because the mean of its divisors is an integer number (146286).

2^2091738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2091738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2340576).

2091738 is an abundant number, since it is smaller than the sum of its proper divisors (2589414).

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

2091738 is a wasteful number, since it uses less digits than its factorization.

2091738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830.

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

The square root of 2091738 is about 1446.2842044356. The cubic root of 2091738 is about 127.8897569659.

The spelling of 2091738 in words is "two million, ninety-one thousand, seven hundred thirty-eight".