1780542 has 40 divisors (see below), whose sum is σ = 4138200. Its totient is φ = 571536.

The previous prime is 1780523. The next prime is 1780549. The reversal of 1780542 is 2450871.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4509 + ... + 4887.

It is an arithmetic number, because the mean of its divisors is an integer number (103455).

2^1780542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1780542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2069100).

1780542 is an abundant number, since it is smaller than the sum of its proper divisors (2357658).

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

1780542 is a wasteful number, since it uses less digits than its factorization.

1780542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1780542 is about 1334.3695140402. The cubic root of 1780542 is about 121.2041269058.

The spelling of 1780542 in words is "one million, seven hundred eighty thousand, five hundred forty-two".