1805212086 has 16 divisors (see below), whose sum is σ = 3767399424. Its totient is φ = 575574824.

The previous prime is 1805212081. The next prime is 1805212139. The reversal of 1805212086 is 6802125081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1805212081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6540486 + ... + 6540761.

It is an arithmetic number, because the mean of its divisors is an integer number (235462464).

Almost surely, 2^1805212086 is an apocalyptic number.

1805212086 is an abundant number, since it is smaller than the sum of its proper divisors (1962187338).

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

1805212086 is a wasteful number, since it uses less digits than its factorization.

1805212086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13081275.

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 1805212086 is about 42487.7874924077. The cubic root of 1805212086 is about 1217.6133773071.

The spelling of 1805212086 in words is "one billion, eight hundred five million, two hundred twelve thousand, eighty-six".