43728729 has 16 divisors (see below), whose sum is σ = 64194240. Its totient is φ = 26256960.

The previous prime is 43728719. The next prime is 43728733. The reversal of 43728729 is 92782734.

It is not a de Polignac number, because 43728729 - 2¹⁵ = 43695961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43728719) 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, 2482 + ... + 9675.

It is an arithmetic number, because the mean of its divisors is an integer number (4012140).

Almost surely, 2^43728729 is an apocalyptic number.

It is an amenable number.

43728729 is a deficient number, since it is larger than the sum of its proper divisors (20465511).

43728729 is a wasteful number, since it uses less digits than its factorization.

43728729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12280.

The product of its digits is 169344, while the sum is 42.

The square root of 43728729 is about 6612.7701457105. The cubic root of 43728729 is about 352.3078214063.

The spelling of 43728729 in words is "forty-three million, seven hundred twenty-eight thousand, seven hundred twenty-nine".