40880391721 has 27 divisors (see below), whose sum is σ = 44998874487. Its totient is φ = 37121900400.

The previous prime is 40880391719. The next prime is 40880391731. The reversal of 40880391721 is 12719308804.

The square root of 40880391721 is 202189.

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

It can be written as a sum of positive squares in only one way, i.e., 6047395225 + 34832996496 = 77765^2 + 186636^2 .

It is not a de Polignac number, because 40880391721 - 2¹ = 40880391719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40880391731) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 270730996 + ... + 270731146.

It is an arithmetic number, because the mean of its divisors is an integer number (1666624981).

Almost surely, 2^40880391721 is an apocalyptic number.

40880391721 is the 202189-th square number.

40880391721 is the 101095-th centered octagonal number.

It is an amenable number.

40880391721 is a deficient number, since it is larger than the sum of its proper divisors (4118482766).

40880391721 is an equidigital number, since it uses as much as digits as its factorization.

40880391721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 40880391721 in words is "forty billion, eight hundred eighty million, three hundred ninety-one thousand, seven hundred twenty-one".