43921487 has 4 divisors (see below), whose sum is σ = 43961520. Its totient is φ = 43881456.

The previous prime is 43921477. The next prime is 43921531. The reversal of 43921487 is 78412934.

43921487 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.

It is a cyclic number.

It is not a de Polignac number, because 43921487 - 2¹⁰ = 43920463 is a prime.

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 43921487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43921477) 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, 18323 + ... + 20580.

It is an arithmetic number, because the mean of its divisors is an integer number (10990380).

Almost surely, 2^43921487 is an apocalyptic number.

43921487 is a deficient number, since it is larger than the sum of its proper divisors (40033).

43921487 is a wasteful number, since it uses less digits than its factorization.

43921487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40032.

The product of its digits is 48384, while the sum is 38.

The square root of 43921487 is about 6627.3287982414. The cubic root of 43921487 is about 352.8247249971.

The spelling of 43921487 in words is "forty-three million, nine hundred twenty-one thousand, four hundred eighty-seven".