1813229639 has 12 divisors (see below), whose sum is σ = 2074335144. Its totient is φ = 1575291264.

The previous prime is 1813229629. The next prime is 1813229647. The reversal of 1813229639 is 9369223181.

It is not a de Polignac number, because 1813229639 - 2²⁴ = 1796452423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1813229639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813229629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237557 + ... + 245070.

It is an arithmetic number, because the mean of its divisors is an integer number (172861262).

Almost surely, 2^1813229639 is an apocalyptic number.

1813229639 is a deficient number, since it is larger than the sum of its proper divisors (261105505).

1813229639 is a wasteful number, since it uses less digits than its factorization.

1813229639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482674 (or 482657 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 1813229639 is about 42582.0342280638. The cubic root of 1813229639 is about 1219.4133251537.

The spelling of 1813229639 in words is "one billion, eight hundred thirteen million, two hundred twenty-nine thousand, six hundred thirty-nine".