1813920409 has 8 divisors (see below), whose sum is σ = 2091398400. Its totient is φ = 1541029056.

The previous prime is 1813920347. The next prime is 1813920421. The reversal of 1813920409 is 9040293181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1813920409 - 2¹⁷ = 1813789337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1813920469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1145809 + ... + 1147390.

It is an arithmetic number, because the mean of its divisors is an integer number (261424800).

Almost surely, 2^1813920409 is an apocalyptic number.

It is an amenable number.

1813920409 is a deficient number, since it is larger than the sum of its proper divisors (277477991).

1813920409 is a wasteful number, since it uses less digits than its factorization.

1813920409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2293319.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1813920409 is about 42590.1445055074. The cubic root of 1813920409 is about 1219.5681551839.

The spelling of 1813920409 in words is "one billion, eight hundred thirteen million, nine hundred twenty thousand, four hundred nine".