1818905434 has 8 divisors (see below), whose sum is σ = 2748273588. Its totient is φ = 902814240.

The previous prime is 1818905423. The next prime is 1818905441. The reversal of 1818905434 is 4345098181.

It can be written as a sum of positive squares in 2 ways, for example, as 1789713025 + 29192409 = 42305^2 + 5403^2 .

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

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3318897 + ... + 3319444.

Almost surely, 2^1818905434 is an apocalyptic number.

1818905434 is a deficient number, since it is larger than the sum of its proper divisors (929368154).

1818905434 is a wasteful number, since it uses less digits than its factorization.

1818905434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6638480.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 1818905434 is about 42648.6275746360. The cubic root of 1818905434 is about 1220.6843410415.

The spelling of 1818905434 in words is "one billion, eight hundred eighteen million, nine hundred five thousand, four hundred thirty-four".