2540399761 has 16 divisors (see below), whose sum is σ = 2647767040. Its totient is φ = 2435209920.

The previous prime is 2540399759. The next prime is 2540399783. The reversal of 2540399761 is 1679930452.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2540399761 - 2¹ = 2540399759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540399791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2562976 + ... + 2563966.

It is an arithmetic number, because the mean of its divisors is an integer number (165485440).

Almost surely, 2^2540399761 is an apocalyptic number.

It is an amenable number.

2540399761 is a deficient number, since it is larger than the sum of its proper divisors (107367279).

2540399761 is an equidigital number, since it uses as much as digits as its factorization.

2540399761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 2540399761 is about 50402.3785252244. The cubic root of 2540399761 is about 1364.4805657324.

The spelling of 2540399761 in words is "two billion, five hundred forty million, three hundred ninety-nine thousand, seven hundred sixty-one".