2091390 has 64 divisors (see below), whose sum is σ = 5999616. Its totient is φ = 456192.

The previous prime is 2091389. The next prime is 2091409. The reversal of 2091390 is 931902.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2091390.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4614 + ... + 5046.

It is an arithmetic number, because the mean of its divisors is an integer number (93744).

2^2091390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2091390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2999808).

2091390 is an abundant number, since it is smaller than the sum of its proper divisors (3908226).

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

2091390 is a wasteful number, since it uses less digits than its factorization.

2091390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 2091390 is about 1446.1638911271. The cubic root of 2091390 is about 127.8826642828.

The spelling of 2091390 in words is "two million, ninety-one thousand, three hundred ninety".