1670689 has 4 divisors (see below), whose sum is σ = 1758640. Its totient is φ = 1582740.

The previous prime is 1670687. The next prime is 1670717. The reversal of 1670689 is 9860761.

1670689 = 60² + 61² + ... + 173².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9860761 = 389 ⋅25349.

It is a cyclic number.

It is not a de Polignac number, because 1670689 - 2¹ = 1670687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1670687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43947 + ... + 43984.

It is an arithmetic number, because the mean of its divisors is an integer number (439660).

2^1670689 is an apocalyptic number.

1670689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1670689 is a deficient number, since it is larger than the sum of its proper divisors (87951).

1670689 is an equidigital number, since it uses as much as digits as its factorization.

1670689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87950.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 1670689 is about 1292.5513529450. The cubic root of 1670689 is about 118.6584135923.

The spelling of 1670689 in words is "one million, six hundred seventy thousand, six hundred eighty-nine".