667145 has 16 divisors (see below), whose sum is σ = 855360. Its totient is φ = 498624.

The previous prime is 667141. The next prime is 667171. The reversal of 667145 is 541766.

It is a cyclic number.

It is not a de Polignac number, because 667145 - 2² = 667141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (667141) 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, 6182 + ... + 6288.

It is an arithmetic number, because the mean of its divisors is an integer number (53460).

2⁶⁶⁷¹⁴⁵ is an apocalyptic number.

It is an amenable number.

667145 is a deficient number, since it is larger than the sum of its proper divisors (188215).

667145 is a wasteful number, since it uses less digits than its factorization.

667145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184.

The product of its digits is 5040, while the sum is 29.

The square root of 667145 is about 816.7894465528. The cubic root of 667145 is about 87.3789346115.

667145 divided by its sum of digits (29) gives a triangular number (23005 = T₂₁₄).

The spelling of 667145 in words is "six hundred sixty-seven thousand, one hundred forty-five".