1670645 has 8 divisors (see below), whose sum is σ = 2035104. Its totient is φ = 1316304.

The previous prime is 1670639. The next prime is 1670653. The reversal of 1670645 is 5460761.

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

It is a cyclic number.

It is not a de Polignac number, because 1670645 - 2⁴ = 1670629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2159 + ... + 2828.

It is an arithmetic number, because the mean of its divisors is an integer number (254388).

2^1670645 is an apocalyptic number.

It is an amenable number.

1670645 is a deficient number, since it is larger than the sum of its proper divisors (364459).

1670645 is an equidigital number, since it uses as much as digits as its factorization.

1670645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5059.

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

The square root of 1670645 is about 1292.5343322326. The cubic root of 1670645 is about 118.6573719031.

The spelling of 1670645 in words is "one million, six hundred seventy thousand, six hundred forty-five".