2499785309 has 8 divisors (see below), whose sum is σ = 2860657728. Its totient is φ = 2139852960.

The previous prime is 2499785303. The next prime is 2499785339. The reversal of 2499785309 is 9035879942.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-2499785309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2499785303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229307 + ... + 239960.

It is an arithmetic number, because the mean of its divisors is an integer number (357582216).

Almost surely, 2^2499785309 is an apocalyptic number.

It is an amenable number.

2499785309 is a deficient number, since it is larger than the sum of its proper divisors (360872419).

2499785309 is an equidigital number, since it uses as much as digits as its factorization.

2499785309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470035.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The square root of 2499785309 is about 49997.8530439058. The cubic root of 2499785309 is about 1357.1699564498.

The spelling of 2499785309 in words is "two billion, four hundred ninety-nine million, seven hundred eighty-five thousand, three hundred nine".