43649893 has 4 divisors (see below), whose sum is σ = 49885600. Its totient is φ = 37414188.

The previous prime is 43649869. The next prime is 43649909. The reversal of 43649893 is 39894634.

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 not a de Polignac number, because 43649893 - 2⁵ = 43649861 is a prime.

It is a super-2 number, since 2×43649893² = 3810626317822898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43649293) 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, 3117843 + ... + 3117856.

It is an arithmetic number, because the mean of its divisors is an integer number (12471400).

Almost surely, 2^43649893 is an apocalyptic number.

It is an amenable number.

43649893 is a deficient number, since it is larger than the sum of its proper divisors (6235707).

43649893 is an equidigital number, since it uses as much as digits as its factorization.

43649893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6235706.

The product of its digits is 559872, while the sum is 46.

The square root of 43649893 is about 6606.8065659591. The cubic root of 43649893 is about 352.0959755724.

The spelling of 43649893 in words is "forty-three million, six hundred forty-nine thousand, eight hundred ninety-three".