43887913 has 4 divisors (see below), whose sum is σ = 44157328. Its totient is φ = 43618500.

The previous prime is 43887859. The next prime is 43887959. The reversal of 43887913 is 31978834.

It is a happy number.

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 43887913 - 2⁹ = 43887401 is a prime.

It is a super-2 number, since 2×43887913² = 3852297814991138, 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 43887913.

It is not an unprimeable number, because it can be changed into a prime (43887973) 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, 134463 + ... + 134788.

It is an arithmetic number, because the mean of its divisors is an integer number (11039332).

Almost surely, 2^43887913 is an apocalyptic number.

It is an amenable number.

43887913 is a deficient number, since it is larger than the sum of its proper divisors (269415).

43887913 is a wasteful number, since it uses less digits than its factorization.

43887913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269414.

The product of its digits is 145152, while the sum is 43.

The square root of 43887913 is about 6624.7953175928. The cubic root of 43887913 is about 352.7348012283.

The spelling of 43887913 in words is "forty-three million, eight hundred eighty-seven thousand, nine hundred thirteen".