2309391 has 20 divisors (see below), whose sum is σ = 3943632. Its totient is φ = 1319328.

The previous prime is 2309389. The next prime is 2309413. The reversal of 2309391 is 1939032.

It is not a de Polignac number, because 2309391 - 2¹ = 2309389 is a prime.

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

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2309341) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1470 + ... + 2603.

2^2309391 is an apocalyptic number.

2309391 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2309391 is a deficient number, since it is larger than the sum of its proper divisors (1634241).

2309391 is an equidigital number, since it uses as much as digits as its factorization.

2309391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092 (or 4083 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 2309391 is about 1519.6680558596. The cubic root of 2309391 is about 132.1800229662.

The spelling of 2309391 in words is "two million, three hundred nine thousand, three hundred ninety-one".