43987867 has 16 divisors (see below), whose sum is σ = 56736000. Its totient is φ = 33092640.

The previous prime is 43987861. The next prime is 43987897. The reversal of 43987867 is 76878934.

It is a happy number.

It is not a de Polignac number, because 43987867 - 2³ = 43987859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43987861) 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, 7617 + ... + 12082.

It is an arithmetic number, because the mean of its divisors is an integer number (3546000).

Almost surely, 2^43987867 is an apocalyptic number.

43987867 is a deficient number, since it is larger than the sum of its proper divisors (12748133).

43987867 is a wasteful number, since it uses less digits than its factorization.

43987867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19746.

The product of its digits is 2032128, while the sum is 52.

The square root of 43987867 is about 6632.3349583687. The cubic root of 43987867 is about 353.0023807644.

The spelling of 43987867 in words is "forty-three million, nine hundred eighty-seven thousand, eight hundred sixty-seven".