1816815406 has 16 divisors (see below), whose sum is σ = 3115127520. Its totient is φ = 778488480.

The previous prime is 1816815367. The next prime is 1816815421. The reversal of 1816815406 is 6045186181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100716 + ... + 117376.

It is an arithmetic number, because the mean of its divisors is an integer number (194695470).

Almost surely, 2^1816815406 is an apocalyptic number.

1816815406 is a deficient number, since it is larger than the sum of its proper divisors (1298312114).

1816815406 is a wasteful number, since it uses less digits than its factorization.

1816815406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24459.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 1816815406 is about 42624.1176565568. The cubic root of 1816815406 is about 1220.2166161098.

The spelling of 1816815406 in words is "one billion, eight hundred sixteen million, eight hundred fifteen thousand, four hundred six".