2445309 has 24 divisors (see below), whose sum is σ = 3800160. Its totient is φ = 1569456.

The previous prime is 2445301. The next prime is 2445343. The reversal of 2445309 is 9035442.

It is not a de Polignac number, because 2445309 - 2³ = 2445301 is a prime.

It is a super-2 number, since 2×2445309² = 11959072210962, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2445301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6874 + ... + 7220.

It is an arithmetic number, because the mean of its divisors is an integer number (158340).

2^2445309 is an apocalyptic number.

2445309 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2445309 is a deficient number, since it is larger than the sum of its proper divisors (1354851).

2445309 is an equidigital number, since it uses as much as digits as its factorization.

2445309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 2445309 is about 1563.7483812941. The cubic root of 2445309 is about 134.7238800723.

The spelling of 2445309 in words is "two million, four hundred forty-five thousand, three hundred nine".