1005399 has 16 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 640728.

The previous prime is 1005391. The next prime is 1005409. The reversal of 1005399 is 9935001.

It is not a de Polignac number, because 1005399 - 2³ = 1005391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

1005399 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189 + ... + 1430.

It is an arithmetic number, because the mean of its divisors is an integer number (97200).

2^1005399 is an apocalyptic number.

1005399 is a deficient number, since it is larger than the sum of its proper divisors (549801).

1005399 is a wasteful number, since it uses less digits than its factorization.

1005399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651 (or 1645 counting only the distinct ones).

The product of its (nonzero) digits is 1215, while the sum is 27.

The square root of 1005399 is about 1002.6958661528. The cubic root of 1005399 is about 100.1796437546.

The spelling of 1005399 in words is "one million, five thousand, three hundred ninety-nine".