43139887 has 4 divisors (see below), whose sum is σ = 49302736. Its totient is φ = 36977040.

The previous prime is 43139867. The next prime is 43139917. The reversal of 43139887 is 78893134.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43139887 is a prime.

It is a super-2 number, since 2×43139887² = 3722099700745538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43139807) 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, 3081414 + ... + 3081427.

It is an arithmetic number, because the mean of its divisors is an integer number (12325684).

Almost surely, 2^43139887 is an apocalyptic number.

43139887 is a deficient number, since it is larger than the sum of its proper divisors (6162849).

43139887 is an equidigital number, since it uses as much as digits as its factorization.

43139887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6162848.

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

The square root of 43139887 is about 6568.0961472865. The cubic root of 43139887 is about 350.7193016686.

The spelling of 43139887 in words is "forty-three million, one hundred thirty-nine thousand, eight hundred eighty-seven".