1670989 has 4 divisors (see below), whose sum is σ = 1683324. Its totient is φ = 1658656.

The previous prime is 1670983. The next prime is 1671041. The reversal of 1670989 is 9890761.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1085764 + 585225 = 1042^2 + 765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1670989 - 2⁹ = 1670477 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1670983) 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, 5962 + ... + 6235.

It is an arithmetic number, because the mean of its divisors is an integer number (420831).

2^1670989 is an apocalyptic number.

It is an amenable number.

1670989 is a deficient number, since it is larger than the sum of its proper divisors (12335).

1670989 is a wasteful number, since it uses less digits than its factorization.

1670989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12334.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 1670989 is about 1292.6673972836. The cubic root of 1670989 is about 118.6655155312.

The spelling of 1670989 in words is "one million, six hundred seventy thousand, nine hundred eighty-nine".