43139881 has 8 divisors (see below), whose sum is σ = 45111744. Its totient is φ = 41176080.

The previous prime is 43139867. The next prime is 43139917. The reversal of 43139881 is 18893134.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43139881 - 2⁷ = 43139753 is a prime.

It is a super-2 number, since 2×43139881² = 3722098665388322, 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 43139881.

It is not an unprimeable number, because it can be changed into a prime (43139801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10710 + ... + 14176.

It is an arithmetic number, because the mean of its divisors is an integer number (5638968).

Almost surely, 2^43139881 is an apocalyptic number.

It is an amenable number.

43139881 is a deficient number, since it is larger than the sum of its proper divisors (1971863).

43139881 is a wasteful number, since it uses less digits than its factorization.

43139881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4031.

The product of its digits is 20736, while the sum is 37.

The square root of 43139881 is about 6568.0956905331. The cubic root of 43139881 is about 350.7192854089.

The spelling of 43139881 in words is "forty-three million, one hundred thirty-nine thousand, eight hundred eighty-one".