43887381 has 16 divisors (see below), whose sum is σ = 61904256. Its totient is φ = 27599616.

The previous prime is 43887377. The next prime is 43887383. The reversal of 43887381 is 18378834.

It is not a de Polignac number, because 43887381 - 2² = 43887377 is a prime.

It is a super-2 number, since 2×43887381² = 3852204422078322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43887383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 681 + ... + 9393.

It is an arithmetic number, because the mean of its divisors is an integer number (3869016).

Almost surely, 2^43887381 is an apocalyptic number.

It is an amenable number.

43887381 is a deficient number, since it is larger than the sum of its proper divisors (18016875).

43887381 is a wasteful number, since it uses less digits than its factorization.

43887381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8812.

The product of its digits is 129024, while the sum is 42.

The square root of 43887381 is about 6624.7551652872. The cubic root of 43887381 is about 352.7333759636.

The spelling of 43887381 in words is "forty-three million, eight hundred eighty-seven thousand, three hundred eighty-one".