999387 has 6 divisors (see below), whose sum is σ = 1443572. Its totient is φ = 666252.

The previous prime is 999377. The next prime is 999389. The reversal of 999387 is 783999.

It is a happy number.

It is not a de Polignac number, because 999387 - 2⁴ = 999371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55513 + ... + 55530.

2⁹⁹⁹³⁸⁷ is an apocalyptic number.

999387 is a deficient number, since it is larger than the sum of its proper divisors (444185).

999387 is a wasteful number, since it uses less digits than its factorization.

999387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111049 (or 111046 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 999387 is about 999.6934530145. The cubic root of 999387 is about 99.9795624900.

The spelling of 999387 in words is "nine hundred ninety-nine thousand, three hundred eighty-seven".