1662689 has 8 divisors (see below), whose sum is σ = 1909440. Its totient is φ = 1418256.

The previous prime is 1662667. The next prime is 1662697. The reversal of 1662689 is 9862661.

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

It is not a de Polignac number, because 1662689 - 2¹⁶ = 1597153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1662629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1442 + ... + 2324.

It is an arithmetic number, because the mean of its divisors is an integer number (238680).

2^1662689 is an apocalyptic number.

It is an amenable number.

1662689 is a deficient number, since it is larger than the sum of its proper divisors (246751).

1662689 is an equidigital number, since it uses as much as digits as its factorization.

1662689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159.

The product of its digits is 31104, while the sum is 38.

The square root of 1662689 is about 1289.4529847963. The cubic root of 1662689 is about 118.4687141084.

The spelling of 1662689 in words is "one million, six hundred sixty-two thousand, six hundred eighty-nine".