1780897 has 4 divisors (see below), whose sum is σ = 1803520. Its totient is φ = 1758276.

The previous prime is 1780879. The next prime is 1780901. The reversal of 1780897 is 7980871.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1780897 - 2¹⁵ = 1748129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1780817) 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, 11193 + ... + 11350.

It is an arithmetic number, because the mean of its divisors is an integer number (450880).

2^1780897 is an apocalyptic number.

It is an amenable number.

1780897 is a deficient number, since it is larger than the sum of its proper divisors (22623).

1780897 is an equidigital number, since it uses as much as digits as its factorization.

1780897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22622.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 1780897 is about 1334.5025290347. The cubic root of 1780897 is about 121.2121814956.

The spelling of 1780897 in words is "one million, seven hundred eighty thousand, eight hundred ninety-seven".