1780434 has 16 divisors (see below), whose sum is σ = 3956640. Its totient is φ = 593460.

The previous prime is 1780411. The next prime is 1780439. The reversal of 1780434 is 4340871.

It is a hoax number, since the sum of its digits (27) 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 (27).

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1780398 and 1780407.

It is not an unprimeable number, because it can be changed into a prime (1780439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16432 + ... + 16539.

It is an arithmetic number, because the mean of its divisors is an integer number (247290).

2^1780434 is an apocalyptic number.

1780434 is an abundant number, since it is smaller than the sum of its proper divisors (2176206).

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

1780434 is a wasteful number, since it uses less digits than its factorization.

1780434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32982 (or 32976 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 1780434 is about 1334.3290448761. The cubic root of 1780434 is about 121.2016762831.

The spelling of 1780434 in words is "one million, seven hundred eighty thousand, four hundred thirty-four".