43913987 has 4 divisors (see below), whose sum is σ = 47292000. Its totient is φ = 40535976.

The previous prime is 43913983. The next prime is 43914001. The reversal of 43913987 is 78931934.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 43913987 - 2² = 43913983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43913983) 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 3 ways as a sum of consecutive naturals, for example, 1688987 + ... + 1689012.

It is an arithmetic number, because the mean of its divisors is an integer number (11823000).

Almost surely, 2^43913987 is an apocalyptic number.

43913987 is a deficient number, since it is larger than the sum of its proper divisors (3378013).

43913987 is a wasteful number, since it uses less digits than its factorization.

43913987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3378012.

The product of its digits is 163296, while the sum is 44.

The square root of 43913987 is about 6626.7629352498. The cubic root of 43913987 is about 352.8046411593.

The spelling of 43913987 in words is "forty-three million, nine hundred thirteen thousand, nine hundred eighty-seven".