1665967 has 2 divisors, whose sum is σ = 1665968. Its totient is φ = 1665966.

The previous prime is 1665943. The next prime is 1665973. The reversal of 1665967 is 7695661.

It is a strong prime.

It is an emirp because it is prime and its reverse (7695661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1665967 - 2¹¹ = 1663919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832983 + 832984.

It is an arithmetic number, because the mean of its divisors is an integer number (832984).

2^1665967 is an apocalyptic number.

1665967 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665967 is an equidigital number, since it uses as much as digits as its factorization.

1665967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 1665967 is about 1290.7234405557. The cubic root of 1665967 is about 118.5465168963.

The spelling of 1665967 in words is "one million, six hundred sixty-five thousand, nine hundred sixty-seven".