43860009590721 has 81 divisors (see below), whose sum is σ = 67911315735081. Its totient is φ = 27274882377600.

The previous prime is 43860009590707. The next prime is 43860009590731. The reversal of 43860009590721 is 12709590006834.

The square root of 43860009590721 is 6622689.

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

43860009590721 is a `hidden beast` number, since 4 + 3 + 8 + 600 + 0 + 9 + 5 + 9 + 0 + 7 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6940532291121 + 36919477299600 = 2634489^2 + 6076140^2 .

It is not a de Polignac number, because 43860009590721 - 2¹⁷ = 43860009459649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43860009590731) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 18735586011 + ... + 18735588351.

It is a 1-persistent number, because it is pandigital, but 2⋅43860009590721 = 87720019181442 is not.

Almost surely, 2^{43860009590721} is an apocalyptic number.

43860009590721 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

43860009590721 is the 6622689-th square number.

43860009590721 is the 3311345-th centered octagonal number.

It is an amenable number.

43860009590721 is a deficient number, since it is larger than the sum of its proper divisors (24051306144360).

43860009590721 is an frugal number, since it uses more digits than its factorization.

43860009590721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4816 (or 2408 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 43860009590721 in words is "forty-three trillion, eight hundred sixty billion, nine million, five hundred ninety thousand, seven hundred twenty-one".