1345999 has 4 divisors (see below), whose sum is σ = 1348336. Its totient is φ = 1343664.

The previous prime is 1345997. The next prime is 1346003. The reversal of 1345999 is 9995431.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1345999 - 2¹ = 1345997 is a prime.

It is a Duffinian number.

1345999 is a lucky number.

It is a plaindrome in base 10 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382 + ... + 1684.

It is an arithmetic number, because the mean of its divisors is an integer number (337084).

2^1345999 is an apocalyptic number.

1345999 is a deficient number, since it is larger than the sum of its proper divisors (2337).

1345999 is a wasteful number, since it uses less digits than its factorization.

1345999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2336.

The product of its digits is 43740, while the sum is 40.

The square root of 1345999 is about 1160.1719700113. The cubic root of 1345999 is about 110.4116531405.

The spelling of 1345999 in words is "one million, three hundred forty-five thousand, nine hundred ninety-nine".