2309857638 has 32 divisors (see below), whose sum is σ = 5062321152. Its totient is φ = 696813600.

The previous prime is 2309857637. The next prime is 2309857651. The reversal of 2309857638 is 8367589032.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2309857637) 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, 63753 + ... + 93188.

It is an arithmetic number, because the mean of its divisors is an integer number (158197536).

Almost surely, 2^2309857638 is an apocalyptic number.

2309857638 is an abundant number, since it is smaller than the sum of its proper divisors (2752463514).

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

2309857638 is a wasteful number, since it uses less digits than its factorization.

2309857638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157180.

The product of its (nonzero) digits is 2177280, while the sum is 51.

The square root of 2309857638 is about 48060.9783296179. The cubic root of 2309857638 is about 1321.8892517865.

The spelling of 2309857638 in words is "two billion, three hundred nine million, eight hundred fifty-seven thousand, six hundred thirty-eight".