1806499644 has 12 divisors (see below), whose sum is σ = 4215165864. Its totient is φ = 602166544.

The previous prime is 1806499637. The next prime is 1806499663. The reversal of 1806499644 is 4469946081.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 75270807 + ... + 75270830.

It is an arithmetic number, because the mean of its divisors is an integer number (351263822).

Almost surely, 2^1806499644 is an apocalyptic number.

It is an amenable number.

1806499644 is an abundant number, since it is smaller than the sum of its proper divisors (2408666220).

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

1806499644 is a wasteful number, since it uses less digits than its factorization.

1806499644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150541644 (or 150541642 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The square root of 1806499644 is about 42502.9368867611. The cubic root of 1806499644 is about 1217.9027939497.

The spelling of 1806499644 in words is "one billion, eight hundred six million, four hundred ninety-nine thousand, six hundred forty-four".