1813257849 has 16 divisors (see below), whose sum is σ = 2636614400. Its totient is φ = 1101724416.

The previous prime is 1813257839. The next prime is 1813257911. The reversal of 1813257849 is 9487523181.

It is not a de Polignac number, because 1813257849 - 2⁹ = 1813257337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1813257798 and 1813257807.

It is not an unprimeable number, because it can be changed into a prime (1813257839) 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, 291184 + ... + 297345.

It is an arithmetic number, because the mean of its divisors is an integer number (164788400).

Almost surely, 2^1813257849 is an apocalyptic number.

It is an amenable number.

1813257849 is a deficient number, since it is larger than the sum of its proper divisors (823356551).

1813257849 is a wasteful number, since it uses less digits than its factorization.

1813257849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588624.

The product of its digits is 483840, while the sum is 48.

The square root of 1813257849 is about 42582.3654697575. The cubic root of 1813257849 is about 1219.4196489475.

The spelling of 1813257849 in words is "one billion, eight hundred thirteen million, two hundred fifty-seven thousand, eight hundred forty-nine".