1815782345 has 16 divisors (see below), whose sum is σ = 2347851072. Its totient is φ = 1340141760.

The previous prime is 1815782333. The next prime is 1815782351. The reversal of 1815782345 is 5432875181.

It is not a de Polignac number, because 1815782345 - 2¹² = 1815778249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1815782296 and 1815782305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128690 + ... + 142100.

It is an arithmetic number, because the mean of its divisors is an integer number (146740692).

Almost surely, 2^1815782345 is an apocalyptic number.

It is an amenable number.

1815782345 is a deficient number, since it is larger than the sum of its proper divisors (532068727).

1815782345 is a wasteful number, since it uses less digits than its factorization.

1815782345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15512.

The product of its digits is 268800, while the sum is 44.

The square root of 1815782345 is about 42611.9976649769. The cubic root of 1815782345 is about 1219.9852961141.

The spelling of 1815782345 in words is "one billion, eight hundred fifteen million, seven hundred eighty-two thousand, three hundred forty-five".