1863636404 has 36 divisors (see below), whose sum is σ = 3810635136. Its totient is φ = 795163824.

The previous prime is 1863636389. The next prime is 1863636409. The reversal of 1863636404 is 4046363681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1863636409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23549 + ... + 65435.

It is an arithmetic number, because the mean of its divisors is an integer number (105850976).

Almost surely, 2^1863636404 is an apocalyptic number.

1863636404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1863636404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1905317568).

1863636404 is an abundant number, since it is smaller than the sum of its proper divisors (1946998732).

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

1863636404 is a wasteful number, since it uses less digits than its factorization.

1863636404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42132 (or 42123 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 41.

The square root of 1863636404 is about 43169.8552696207. The cubic root of 1863636404 is about 1230.6098731564.

The spelling of 1863636404 in words is "one billion, eight hundred sixty-three million, six hundred thirty-six thousand, four hundred four".