43648381 has 4 divisors (see below), whose sum is σ = 49883872. Its totient is φ = 37412892.

The previous prime is 43648373. The next prime is 43648387. The reversal of 43648381 is 18384634.

43648381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 43648381 - 2³ = 43648373 is a prime.

It is a super-2 number, since 2×43648381² = 3810362327842322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43648381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43648387) 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, 3117735 + ... + 3117748.

It is an arithmetic number, because the mean of its divisors is an integer number (12470968).

Almost surely, 2^43648381 is an apocalyptic number.

It is an amenable number.

43648381 is a deficient number, since it is larger than the sum of its proper divisors (6235491).

43648381 is an equidigital number, since it uses as much as digits as its factorization.

43648381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6235490.

The product of its digits is 55296, while the sum is 37.

The square root of 43648381 is about 6606.6921375224. The cubic root of 43648381 is about 352.0919100774.

The spelling of 43648381 in words is "forty-three million, six hundred forty-eight thousand, three hundred eighty-one".