2381899509 has 24 divisors (see below), whose sum is σ = 3781967904. Its totient is φ = 1432548000.

The previous prime is 2381899493. The next prime is 2381899537. The reversal of 2381899509 is 9059981832.

2381899509 is a `hidden beast` number, since 2 + 38 + 18 + 99 + 509 = 666.

It is not a de Polignac number, because 2381899509 - 2⁴ = 2381899493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2381899549) 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, 78862 + ... + 104799.

It is an arithmetic number, because the mean of its divisors is an integer number (157581996).

Almost surely, 2^2381899509 is an apocalyptic number.

It is an amenable number.

2381899509 is a deficient number, since it is larger than the sum of its proper divisors (1400068395).

2381899509 is a wasteful number, since it uses less digits than its factorization.

2381899509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183809 (or 183806 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The square root of 2381899509 is about 48804.7078569271. The cubic root of 2381899509 is about 1335.4915515122.

The spelling of 2381899509 in words is "two billion, three hundred eighty-one million, eight hundred ninety-nine thousand, five hundred nine".