1802189655 has 80 divisors (see below), whose sum is σ = 3716539200. Its totient is φ = 818408448.

The previous prime is 1802189647. The next prime is 1802189671. The reversal of 1802189655 is 5569812081.

It is a happy number.

It is not a de Polignac number, because 1802189655 - 2³ = 1802189647 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1802189655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 443071 + ... + 447119.

It is an arithmetic number, because the mean of its divisors is an integer number (46456740).

Almost surely, 2^1802189655 is an apocalyptic number.

1802189655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1802189655 is an abundant number, since it is smaller than the sum of its proper divisors (1914349545).

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

1802189655 is a wasteful number, since it uses less digits than its factorization.

1802189655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4230 (or 4221 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The square root of 1802189655 is about 42452.2043597267. The cubic root of 1802189655 is about 1216.9334556832.

The spelling of 1802189655 in words is "one billion, eight hundred two million, one hundred eighty-nine thousand, six hundred fifty-five".