43128074929 has 3 divisors (see below), whose sum is σ = 43128282603. Its totient is φ = 43127867256.

The previous prime is 43128074903. The next prime is 43128074933. The reversal of 43128074929 is 92947082134.

The square root of 43128074929 is 207673.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 15688815025 + 27439259904 = 125255^2 + 165648^2 .

It is not a de Polignac number, because 43128074929 - 2¹⁵ = 43128042161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43128074959) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 103837 + ... + 311509.

It is an arithmetic number, because the mean of its divisors is an integer number (14376094201).

Almost surely, 2^43128074929 is an apocalyptic number.

43128074929 is the 207673-rd square number.

43128074929 is the 103837-th centered octagonal number.

It is an amenable number.

43128074929 is a deficient number, since it is larger than the sum of its proper divisors (207674).

43128074929 is an frugal number, since it uses more digits than its factorization.

43128074929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415346 (or 207673 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 49.

Multiplying 43128074929 by its sum of digits (49), we get a square (2113275671521 = 1453711²).

The spelling of 43128074929 in words is "forty-three billion, one hundred twenty-eight million, seventy-four thousand, nine hundred twenty-nine".