43987164 has 48 divisors (see below), whose sum is σ = 110953248. Its totient is φ = 13483008.

The previous prime is 43987157. The next prime is 43987169. The reversal of 43987164 is 46178934.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43987169) 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, 70984 + ... + 71600.

It is an arithmetic number, because the mean of its divisors is an integer number (2311526).

Almost surely, 2^43987164 is an apocalyptic number.

It is an amenable number.

43987164 is an abundant number, since it is smaller than the sum of its proper divisors (66966084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43987164 is a wasteful number, since it uses less digits than its factorization.

43987164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094 (or 1092 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 43987164 is about 6632.2819602306. The cubic root of 43987164 is about 353.0005002307. Note that the first 3 decimals are identical.

The spelling of 43987164 in words is "forty-three million, nine hundred eighty-seven thousand, one hundred sixty-four".