2780317 has 4 divisors (see below), whose sum is σ = 2876220. Its totient is φ = 2684416.

The previous prime is 2780303. The next prime is 2780329. The reversal of 2780317 is 7130872.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1572516 + 1207801 = 1254^2 + 1099^2 .

It is a cyclic number.

It is not a de Polignac number, because 2780317 - 2¹⁹ = 2256029 is a prime.

It is an Ulam number.

2780317 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780357) 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, 47908 + ... + 47965.

It is an arithmetic number, because the mean of its divisors is an integer number (719055).

2^2780317 is an apocalyptic number.

It is an amenable number.

2780317 is a deficient number, since it is larger than the sum of its proper divisors (95903).

2780317 is an equidigital number, since it uses as much as digits as its factorization.

2780317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95902.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 2780317 is about 1667.4282593263. The cubic root of 2780317 is about 140.6149310980.

The spelling of 2780317 in words is "two million, seven hundred eighty thousand, three hundred seventeen".