1667001 has 16 divisors (see below), whose sum is σ = 2561024. Its totient is φ = 944784.

The previous prime is 1666999. The next prime is 1667033. The reversal of 1667001 is 1007661.

It is not a de Polignac number, because 1667001 - 2¹ = 1666999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

1667001 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1667051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3180 + ... + 3666.

It is an arithmetic number, because the mean of its divisors is an integer number (160064).

2^1667001 is an apocalyptic number.

It is an amenable number.

1667001 is a deficient number, since it is larger than the sum of its proper divisors (894023).

1667001 is a wasteful number, since it uses less digits than its factorization.

1667001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 1667001 is about 1291.1239289859. The cubic root of 1667001 is about 118.5710375396.

The spelling of 1667001 in words is "one million, six hundred sixty-seven thousand, one".