1007999 has 4 divisors (see below), whose sum is σ = 1016064. Its totient is φ = 999936.

The previous prime is 1007977. The next prime is 1008001. The reversal of 1007999 is 9997001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9997001 = 7 ⋅1428143.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1007999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1007939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3842 + ... + 4095.

It is an arithmetic number, because the mean of its divisors is an integer number (254016).

2^1007999 is an apocalyptic number.

1007999 is a deficient number, since it is larger than the sum of its proper divisors (8065).

1007999 is an equidigital number, since it uses as much as digits as its factorization.

1007999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8064.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 1007999 is about 1003.9915338288. The cubic root of 1007999 is about 100.2659255425.

The spelling of 1007999 in words is "one million, seven thousand, nine hundred ninety-nine".