1866971 has 2 divisors, whose sum is σ = 1866972. Its totient is φ = 1866970.

The previous prime is 1866967. The next prime is 1866973. The reversal of 1866971 is 1796681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1866971 - 2² = 1866967 is a prime.

Together with 1866973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1866973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933485 + 933486.

It is an arithmetic number, because the mean of its divisors is an integer number (933486).

2^1866971 is an apocalyptic number.

1866971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866971 is an equidigital number, since it uses as much as digits as its factorization.

1866971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 38.

The square root of 1866971 is about 1366.3714721846. The cubic root of 1866971 is about 123.1343410677.

The spelling of 1866971 in words is "one million, eight hundred sixty-six thousand, nine hundred seventy-one".