1690889 has 4 divisors (see below), whose sum is σ = 1730256. Its totient is φ = 1651524.

The previous prime is 1690883. The next prime is 1690901. The reversal of 1690889 is 9880961.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1690889 is a prime.

It is a super-2 number, since 2×1690889² = 5718211220642, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1690883) 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, 19619 + ... + 19704.

It is an arithmetic number, because the mean of its divisors is an integer number (432564).

2^1690889 is an apocalyptic number.

It is an amenable number.

1690889 is a deficient number, since it is larger than the sum of its proper divisors (39367).

1690889 is an equidigital number, since it uses as much as digits as its factorization.

1690889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39366.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1690889 is about 1300.3418781228. The cubic root of 1690889 is about 119.1347248951.

The spelling of 1690889 in words is "one million, six hundred ninety thousand, eight hundred eighty-nine".