1806618436 has 18 divisors (see below), whose sum is σ = 3677759358. Its totient is φ = 774264960.

The previous prime is 1806618431. The next prime is 1806618491. The reversal of 1806618436 is 6348166081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 965966400 + 840652036 = 31080^2 + 28994^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1806618392 and 1806618401.

It is not an unprimeable number, because it can be changed into a prime (1806618431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4608525 + ... + 4608916.

Almost surely, 2^1806618436 is an apocalyptic number.

It is an amenable number.

1806618436 is an abundant number, since it is smaller than the sum of its proper divisors (1871140922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1806618436 is a wasteful number, since it uses less digits than its factorization.

1806618436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9217459 (or 9217450 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 1806618436 is about 42504.3343201608. The cubic root of 1806618436 is about 1217.9294890260.

The spelling of 1806618436 in words is "one billion, eight hundred six million, six hundred eighteen thousand, four hundred thirty-six".