2156867 has 2 divisors, whose sum is σ = 2156868. Its totient is φ = 2156866.

The previous prime is 2156857. The next prime is 2156873. The reversal of 2156867 is 7686512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2156867 - 2⁴ = 2156851 is a prime.

It is not a weakly prime, because it can be changed into another prime (2156857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078433 + 1078434.

It is an arithmetic number, because the mean of its divisors is an integer number (1078434).

2^2156867 is an apocalyptic number.

2156867 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156867 is an equidigital number, since it uses as much as digits as its factorization.

2156867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 2156867 is about 1468.6275906437. The cubic root of 2156867 is about 129.2035526058.

The spelling of 2156867 in words is "two million, one hundred fifty-six thousand, eight hundred sixty-seven".