2157863 has 2 divisors, whose sum is σ = 2157864. Its totient is φ = 2157862.

The previous prime is 2157851. The next prime is 2157893. The reversal of 2157863 is 3687512.

It is a happy number.

2157863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2157863 - 2¹⁰ = 2156839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078931 + 1078932.

It is an arithmetic number, because the mean of its divisors is an integer number (1078932).

2^2157863 is an apocalyptic number.

2157863 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157863 is an equidigital number, since it uses as much as digits as its factorization.

2157863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 2157863 is about 1468.9666435968. The cubic root of 2157863 is about 129.2234374565.

The spelling of 2157863 in words is "two million, one hundred fifty-seven thousand, eight hundred sixty-three".