1005021 has 8 divisors (see below), whose sum is σ = 1488960. Its totient is φ = 669996.

The previous prime is 1005019. The next prime is 1005029. The reversal of 1005021 is 1205001.

It is a happy number.

It is not a de Polignac number, because 1005021 - 2¹ = 1005019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1004994 and 1005012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18585 + ... + 18638.

It is an arithmetic number, because the mean of its divisors is an integer number (186120).

2^1005021 is an apocalyptic number.

It is an amenable number.

1005021 is a deficient number, since it is larger than the sum of its proper divisors (483939).

1005021 is an equidigital number, since it uses as much as digits as its factorization.

1005021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37232 (or 37226 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 1005021 is about 1002.5073565815. The cubic root of 1005021 is about 100.1670873294.

The spelling of 1005021 in words is "one million, five thousand, twenty-one".