1005990 has 16 divisors (see below), whose sum is σ = 2414448. Its totient is φ = 268256.

The previous prime is 1005989. The next prime is 1006003. The reversal of 1005990 is 995001.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1005990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16737 + ... + 16796.

It is an arithmetic number, because the mean of its divisors is an integer number (150903).

2^1005990 is an apocalyptic number.

1005990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1005990 is an abundant number, since it is smaller than the sum of its proper divisors (1408458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1005990 is a wasteful number, since it uses less digits than its factorization.

1005990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33543.

The product of its (nonzero) digits is 405, while the sum is 24.

The square root of 1005990 is about 1002.9905283700. The cubic root of 1005990 is about 100.1992693203.

The spelling of 1005990 in words is "one million, five thousand, nine hundred ninety".