1665670 has 8 divisors (see below), whose sum is σ = 2998224. Its totient is φ = 666264.

The previous prime is 1665659. The next prime is 1665679. The reversal of 1665670 is 765661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83274 + ... + 83293.

It is an arithmetic number, because the mean of its divisors is an integer number (374778).

2^1665670 is an apocalyptic number.

1665670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1665670 is a deficient number, since it is larger than the sum of its proper divisors (1332554).

1665670 is a wasteful number, since it uses less digits than its factorization.

1665670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166574.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 1665670 is about 1290.6083836703. The cubic root of 1665670 is about 118.5394718572.

Subtracting from 1665670 its reverse (765661), we obtain a palindrome (900009).

The spelling of 1665670 in words is "one million, six hundred sixty-five thousand, six hundred seventy".