1990469 has 4 divisors (see below), whose sum is σ = 2143596. Its totient is φ = 1837344.

The previous prime is 1990463. The next prime is 1990481. The reversal of 1990469 is 9640991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 702244 + 1288225 = 838^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990469 - 2⁴ = 1990453 is a prime.

It is a super-2 number, since 2×1990469² = 7923933679922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990463) 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, 76544 + ... + 76569.

It is an arithmetic number, because the mean of its divisors is an integer number (535899).

2^1990469 is an apocalyptic number.

It is an amenable number.

1990469 is a deficient number, since it is larger than the sum of its proper divisors (153127).

1990469 is a wasteful number, since it uses less digits than its factorization.

1990469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153126.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 1990469 is about 1410.8398208160. The cubic root of 1990469 is about 125.7916477664.

The spelling of 1990469 in words is "one million, nine hundred ninety thousand, four hundred sixty-nine".