1399005 has 32 divisors (see below), whose sum is σ = 2555520. Its totient is φ = 725760.

The previous prime is 1399003. The next prime is 1399009. The reversal of 1399005 is 5009931.

It is not a de Polignac number, because 1399005 - 2¹ = 1399003 is a prime.

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

It is a Curzon number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 1399005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5685 + ... + 5925.

It is an arithmetic number, because the mean of its divisors is an integer number (79860).

2^1399005 is an apocalyptic number.

1399005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1399005 is a deficient number, since it is larger than the sum of its proper divisors (1156515).

1399005 is a wasteful number, since it uses less digits than its factorization.

1399005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 292 counting only the distinct ones).

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

The square root of 1399005 is about 1182.7954176442. The cubic root of 1399005 is about 111.8423856534.

1399005 divided by its sum of digits (27) gives a palindrome (51815).

The spelling of 1399005 in words is "one million, three hundred ninety-nine thousand, five".