743999 has 4 divisors (see below), whose sum is σ = 746664. Its totient is φ = 741336.

The previous prime is 743989. The next prime is 744019. The reversal of 743999 is 999347.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999347 = 31 ⋅32237.

It is a cyclic number.

It is not a de Polignac number, because 743999 - 2¹⁶ = 678463 is a prime.

It is a Duffinian number.

743999 is a modest number, since divided by 999 gives 743 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (743989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 857 + ... + 1490.

It is an arithmetic number, because the mean of its divisors is an integer number (186666).

2⁷⁴³⁹⁹⁹ is an apocalyptic number.

743999 is a deficient number, since it is larger than the sum of its proper divisors (2665).

743999 is a wasteful number, since it uses less digits than its factorization.

743999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664.

The product of its digits is 61236, while the sum is 41.

The square root of 743999 is about 862.5537664401. The cubic root of 743999 is about 90.6130573244.

The spelling of 743999 in words is "seven hundred forty-three thousand, nine hundred ninety-nine".