1690039 has 4 divisors (see below), whose sum is σ = 1820056. Its totient is φ = 1560024.

The previous prime is 1690019. The next prime is 1690043. The reversal of 1690039 is 9300961.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1690039 - 2⁷ = 1689911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1689989 and 1690016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64989 + ... + 65014.

It is an arithmetic number, because the mean of its divisors is an integer number (455014).

2^1690039 is an apocalyptic number.

1690039 is a deficient number, since it is larger than the sum of its proper divisors (130017).

1690039 is a wasteful number, since it uses less digits than its factorization.

1690039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130016.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 1690039 is about 1300.0149999135. The cubic root of 1690039 is about 119.1147587729.

The spelling of 1690039 in words is "one million, six hundred ninety thousand, thirty-nine".