1780425 has 36 divisors (see below), whose sum is σ = 3283644. Its totient is φ = 921600.

The previous prime is 1780411. The next prime is 1780439. The reversal of 1780425 is 5240871.

It is an interprime number because it is at equal distance from previous prime (1780411) and next prime (1780439).

It can be written as a sum of positive squares in 6 ways, for example, as 501264 + 1279161 = 708^2 + 1131^2 .

It is not a de Polignac number, because 1780425 - 2⁸ = 1780169 is a prime.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 9129 + ... + 9321.

2^1780425 is an apocalyptic number.

1780425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1780425 is a deficient number, since it is larger than the sum of its proper divisors (1503219).

1780425 is a wasteful number, since it uses less digits than its factorization.

1780425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 242 counting only the distinct ones).

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

The square root of 1780425 is about 1334.3256723904. The cubic root of 1780425 is about 121.2014720600.

The spelling of 1780425 in words is "one million, seven hundred eighty thousand, four hundred twenty-five".