743998 has 4 divisors (see below), whose sum is σ = 1116000. Its totient is φ = 371998.

The previous prime is 743989. The next prime is 744019. The reversal of 743998 is 899347.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 899347 = 449 ⋅2003.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 743998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 185998 + ... + 186001.

It is an arithmetic number, because the mean of its divisors is an integer number (279000).

2⁷⁴³⁹⁹⁸ is an apocalyptic number.

743998 is a deficient number, since it is larger than the sum of its proper divisors (372002).

743998 is a wasteful number, since it uses less digits than its factorization.

743998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372001.

The product of its digits is 54432, while the sum is 40.

The square root of 743998 is about 862.5531867659. The cubic root of 743998 is about 90.6130167271.

The spelling of 743998 in words is "seven hundred forty-three thousand, nine hundred ninety-eight".