743681 has 4 divisors (see below), whose sum is σ = 759552. Its totient is φ = 727812.

The previous prime is 743671. The next prime is 743689. The reversal of 743681 is 186347.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 743681 - 2¹⁰ = 742657 is a prime.

It is a super-2 number, since 2×743681² = 1106122859522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (743689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7865 + ... + 7958.

It is an arithmetic number, because the mean of its divisors is an integer number (189888).

2⁷⁴³⁶⁸¹ is an apocalyptic number.

It is an amenable number.

743681 is a deficient number, since it is larger than the sum of its proper divisors (15871).

743681 is a wasteful number, since it uses less digits than its factorization.

743681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15870.

The product of its digits is 4032, while the sum is 29.

The square root of 743681 is about 862.3694104037. The cubic root of 743681 is about 90.6001455424.

The spelling of 743681 in words is "seven hundred forty-three thousand, six hundred eighty-one".