1667997 has 12 divisors (see below), whose sum is σ = 2474940. Its totient is φ = 1081728.

The previous prime is 1667969. The next prime is 1668001. The reversal of 1667997 is 7997661.

It can be written as a sum of positive squares in 2 ways, for example, as 1179396 + 488601 = 1086^2 + 699^2 .

It is not a de Polignac number, because 1667997 - 2⁶ = 1667933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1667917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2172 + ... + 2837.

It is an arithmetic number, because the mean of its divisors is an integer number (206245).

2^1667997 is an apocalyptic number.

It is an amenable number.

1667997 is a deficient number, since it is larger than the sum of its proper divisors (806943).

1667997 is a wasteful number, since it uses less digits than its factorization.

1667997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5052 (or 5049 counting only the distinct ones).

The product of its digits is 142884, while the sum is 45.

The square root of 1667997 is about 1291.5095818460. The cubic root of 1667997 is about 118.5946474516.

The spelling of 1667997 in words is "one million, six hundred sixty-seven thousand, nine hundred ninety-seven".