1690243 has 4 divisors (see below), whose sum is σ = 1703680. Its totient is φ = 1676808.

The previous prime is 1690231. The next prime is 1690253. The reversal of 1690243 is 3420961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3420961 = 17 ⋅201233.

It is a cyclic number.

It is not a de Polignac number, because 1690243 - 2⁵ = 1690211 is a prime.

It is a d-powerful number, because it can be written as 1 + 6 + 9⁵ + 0 + 2¹⁵ + 4⁶ + 3¹³ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1690253) 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, 6528 + ... + 6781.

It is an arithmetic number, because the mean of its divisors is an integer number (425920).

2^1690243 is an apocalyptic number.

1690243 is a deficient number, since it is larger than the sum of its proper divisors (13437).

1690243 is a wasteful number, since it uses less digits than its factorization.

1690243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13436.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1690243 is about 1300.0934581791. The cubic root of 1690243 is about 119.1195512527.

The spelling of 1690243 in words is "one million, six hundred ninety thousand, two hundred forty-three".