743981 has 8 divisors (see below), whose sum is σ = 887424. Its totient is φ = 609840.

The previous prime is 743947. The next prime is 743987. The reversal of 743981 is 189347.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 743981 - 2⁶ = 743917 is a prime.

It is a super-2 number, since 2×743981² = 1107015456722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (743987) 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 7 ways as a sum of consecutive naturals, for example, 2150 + ... + 2471.

It is an arithmetic number, because the mean of its divisors is an integer number (110928).

2⁷⁴³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

743981 is a deficient number, since it is larger than the sum of its proper divisors (143443).

743981 is a wasteful number, since it uses less digits than its factorization.

743981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4651.

The product of its digits is 6048, while the sum is 32.

The square root of 743981 is about 862.5433322448. The cubic root of 743981 is about 90.6123265670.

The spelling of 743981 in words is "seven hundred forty-three thousand, nine hundred eighty-one".