1690071 has 4 divisors (see below), whose sum is σ = 2253432. Its totient is φ = 1126712.

The previous prime is 1690067. The next prime is 1690079. The reversal of 1690071 is 1700961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1700961 = 3 ⋅566987.

It is a cyclic number.

It is not a de Polignac number, because 1690071 - 2² = 1690067 is a prime.

It is a D-number.

1690071 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690079) 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, 281676 + ... + 281681.

It is an arithmetic number, because the mean of its divisors is an integer number (563358).

2^1690071 is an apocalyptic number.

1690071 is a deficient number, since it is larger than the sum of its proper divisors (563361).

1690071 is an equidigital number, since it uses as much as digits as its factorization.

1690071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563360.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 1690071 is about 1300.0273074055. The cubic root of 1690071 is about 119.1155105600.

The spelling of 1690071 in words is "one million, six hundred ninety thousand, seventy-one".