1690012 has 24 divisors (see below), whose sum is σ = 3202640. Its totient is φ = 777600.

The previous prime is 1690009. The next prime is 1690019. The reversal of 1690012 is 2100961.

It is a super-2 number, since 2×1690012² = 5712281120288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690019) 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 7 ways as a sum of consecutive naturals, for example, 2512 + ... + 3112.

2^1690012 is an apocalyptic number.

It is an amenable number.

1690012 is a deficient number, since it is larger than the sum of its proper divisors (1512628).

1690012 is a wasteful number, since it uses less digits than its factorization.

1690012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661 (or 659 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1690012 is about 1300.0046153764. The cubic root of 1690012 is about 119.1141244452.

Adding to 1690012 its reverse (2100961), we get a palindrome (3790973).

The spelling of 1690012 in words is "one million, six hundred ninety thousand, twelve".