1999487 has 4 divisors (see below), whose sum is σ = 2285136. Its totient is φ = 1713840.

The previous prime is 1999471. The next prime is 1999499. The reversal of 1999487 is 7849991.

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

It is a cyclic number.

It is not a de Polignac number, because 1999487 - 2⁴ = 1999471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999187) 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, 142814 + ... + 142827.

It is an arithmetic number, because the mean of its divisors is an integer number (571284).

2^1999487 is an apocalyptic number.

1999487 is a deficient number, since it is larger than the sum of its proper divisors (285649).

1999487 is an equidigital number, since it uses as much as digits as its factorization.

1999487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285648.

The product of its digits is 163296, while the sum is 47.

The square root of 1999487 is about 1414.0321778517. The cubic root of 1999487 is about 125.9813317433.

The spelling of 1999487 in words is "one million, nine hundred ninety-nine thousand, four hundred eighty-seven".