1690045 has 16 divisors (see below), whose sum is σ = 2344320. Its totient is φ = 1145664.

The previous prime is 1690043. The next prime is 1690057. The reversal of 1690045 is 5400961.

It is a cyclic number.

It is not a de Polignac number, because 1690045 - 2¹ = 1690043 is a prime.

It is an Ulam number.

1690045 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690043) 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 15 ways as a sum of consecutive naturals, for example, 3594 + ... + 4036.

It is an arithmetic number, because the mean of its divisors is an integer number (146520).

2^1690045 is an apocalyptic number.

It is an amenable number.

1690045 is a deficient number, since it is larger than the sum of its proper divisors (654275).

1690045 is a wasteful number, since it uses less digits than its factorization.

1690045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1690045 is about 1300.0173075771. The cubic root of 1690045 is about 119.1148997337.

The spelling of 1690045 in words is "one million, six hundred ninety thousand, forty-five".