2178797 has 2 divisors, whose sum is σ = 2178798. Its totient is φ = 2178796.

The previous prime is 2178791. The next prime is 2178823. The reversal of 2178797 is 7978712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1136356 + 1042441 = 1066^2 + 1021^2 .

It is a cyclic number.

It is not a de Polignac number, because 2178797 - 2⁶ = 2178733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2178791) 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 as a sum of consecutive naturals, namely, 1089398 + 1089399.

It is an arithmetic number, because the mean of its divisors is an integer number (1089399).

2^2178797 is an apocalyptic number.

It is an amenable number.

2178797 is a deficient number, since it is larger than the sum of its proper divisors (1).

2178797 is an equidigital number, since it uses as much as digits as its factorization.

2178797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 41.

The square root of 2178797 is about 1476.0748626001. The cubic root of 2178797 is about 129.6399703023.

The spelling of 2178797 in words is "two million, one hundred seventy-eight thousand, seven hundred ninety-seven".