1665674 has 4 divisors (see below), whose sum is σ = 2498514. Its totient is φ = 832836.

The previous prime is 1665659. The next prime is 1665679. The reversal of 1665674 is 4765661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 931225 + 734449 = 965^2 + 857^2 .

It is an Ulam 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 as a sum of consecutive naturals, namely, 416417 + ... + 416420.

2^1665674 is an apocalyptic number.

1665674 is a deficient number, since it is larger than the sum of its proper divisors (832840).

1665674 is an equidigital number, since it uses as much as digits as its factorization.

1665674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832839.

The product of its digits is 30240, while the sum is 35.

The square root of 1665674 is about 1290.6099333261. The cubic root of 1665674 is about 118.5395667454.

The spelling of 1665674 in words is "one million, six hundred sixty-five thousand, six hundred seventy-four".