1780836 has 12 divisors (see below), whose sum is σ = 4155312. Its totient is φ = 593608.

The previous prime is 1780829. The next prime is 1780837. The reversal of 1780836 is 6380871.

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

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1780797 and 1780806.

It is not an unprimeable number, because it can be changed into a prime (1780837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74190 + ... + 74213.

It is an arithmetic number, because the mean of its divisors is an integer number (346276).

2^1780836 is an apocalyptic number.

It is an amenable number.

1780836 is an abundant number, since it is smaller than the sum of its proper divisors (2374476).

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

1780836 is a wasteful number, since it uses less digits than its factorization.

1780836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148410 (or 148408 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 1780836 is about 1334.4796738804. The cubic root of 1780836 is about 121.2107975436.

The spelling of 1780836 in words is "one million, seven hundred eighty thousand, eight hundred thirty-six".