2178073 has 2 divisors, whose sum is σ = 2178074. Its totient is φ = 2178072.

The previous prime is 2178049. The next prime is 2178083. The reversal of 2178073 is 3708712.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2050624 + 127449 = 1432^2 + 357^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2178073 is a prime.

It is not a weakly prime, because it can be changed into another prime (2178083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1089036 + 1089037.

It is an arithmetic number, because the mean of its divisors is an integer number (1089037).

2^2178073 is an apocalyptic number.

It is an amenable number.

2178073 is a deficient number, since it is larger than the sum of its proper divisors (1).

2178073 is an equidigital number, since it uses as much as digits as its factorization.

2178073 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2178073 is about 1475.8295972097. The cubic root of 2178073 is about 129.6256092066.

The spelling of 2178073 in words is "two million, one hundred seventy-eight thousand, seventy-three".