2190857 has 2 divisors, whose sum is σ = 2190858. Its totient is φ = 2190856.

The previous prime is 2190829. The next prime is 2190887. The reversal of 2190857 is 7580912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1666681 + 524176 = 1291^2 + 724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2190857 is a prime.

It is not a weakly prime, because it can be changed into another prime (2190817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095428 + 1095429.

It is an arithmetic number, because the mean of its divisors is an integer number (1095429).

2^2190857 is an apocalyptic number.

It is an amenable number.

2190857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2190857 is an equidigital number, since it uses as much as digits as its factorization.

2190857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 2190857 is about 1480.1543838397. The cubic root of 2190857 is about 129.8787231881.

The spelling of 2190857 in words is "two million, one hundred ninety thousand, eight hundred fifty-seven".