1803961836 has 36 divisors (see below), whose sum is σ = 4561443432. Its totient is φ = 601132224.

The previous prime is 1803961811. The next prime is 1803961837. The reversal of 1803961836 is 6381693081.

It is a happy number.

1803961836 is a `hidden beast` number, since 1 + 80 + 396 + 183 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 1803961791 and 1803961800.

It is not an unprimeable number, because it can be changed into a prime (1803961837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154831 + ... + 166073.

It is an arithmetic number, because the mean of its divisors is an integer number (126706762).

Almost surely, 2^1803961836 is an apocalyptic number.

It is an amenable number.

1803961836 is an abundant number, since it is smaller than the sum of its proper divisors (2757481596).

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

1803961836 is a wasteful number, since it uses less digits than its factorization.

1803961836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15710 (or 15705 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 1803961836 is about 42473.0718926710. The cubic root of 1803961836 is about 1217.3322150152.

The spelling of 1803961836 in words is "one billion, eight hundred three million, nine hundred sixty-one thousand, eight hundred thirty-six".