5639743 has 4 divisors (see below), whose sum is σ = 5719248. Its totient is φ = 5560240.

The previous prime is 5639741. The next prime is 5639749. The reversal of 5639743 is 3479365.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3479365 = 5 ⋅695873.

It is a cyclic number.

It is not a de Polignac number, because 5639743 - 2¹ = 5639741 is a prime.

It is a super-2 number, since 2×5639743² = 63613402212098, which contains 22 as substring.

It is a Duffinian number.

5639743 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5639741) 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, 39646 + ... + 39787.

It is an arithmetic number, because the mean of its divisors is an integer number (1429812).

Almost surely, 2^5639743 is an apocalyptic number.

5639743 is a deficient number, since it is larger than the sum of its proper divisors (79505).

5639743 is an equidigital number, since it uses as much as digits as its factorization.

5639743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79504.

The product of its digits is 68040, while the sum is 37.

The square root of 5639743 is about 2374.8143085302. The cubic root of 5639743 is about 177.9999053149. Note that the first 4 decimals are identical.

The spelling of 5639743 in words is "five million, six hundred thirty-nine thousand, seven hundred forty-three".