1690444 has 12 divisors (see below), whose sum is σ = 3380944. Its totient is φ = 724464.

The previous prime is 1690441. The next prime is 1690483. The reversal of 1690444 is 4440961.

1690444 is an admirable number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 60373 = 1690444 / (1 + 6 + 9 + 0 + 4 + 4 + 4).

It is not an unprimeable number, because it can be changed into a prime (1690441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30159 + ... + 30214.

2^1690444 is an apocalyptic number.

1690444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1690444 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1690444 is a wasteful number, since it uses less digits than its factorization.

1690444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60384 (or 60382 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1690444 is about 1300.1707580160. The cubic root of 1690444 is about 119.1242728777.

The spelling of 1690444 in words is "one million, six hundred ninety thousand, four hundred forty-four".