1040040721 has 2 divisors, whose sum is σ = 1040040722. Its totient is φ = 1040040720.

The previous prime is 1040040697. The next prime is 1040040761. The reversal of 1040040721 is 1270400401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1031694400 + 8346321 = 32120^2 + 2889^2 .

It is a cyclic number.

It is not a de Polignac number, because 1040040721 - 2⁵ = 1040040689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1040040761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520020360 + 520020361.

It is an arithmetic number, because the mean of its divisors is an integer number (520020361).

Almost surely, 2^1040040721 is an apocalyptic number.

It is an amenable number.

1040040721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1040040721 is an equidigital number, since it uses as much as digits as its factorization.

1040040721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 1040040721 is about 32249.6623393176. The cubic root of 1040040721 is about 1013.1726270015.

The spelling of 1040040721 in words is "one billion, forty million, forty thousand, seven hundred twenty-one".