2491045438 has 24 divisors (see below), whose sum is σ = 4358337192. Its totient is φ = 1064713104.

The previous prime is 2491045399. The next prime is 2491045439. The reversal of 2491045438 is 8345401942.

It is a super-2 number, since 2×2491045438² = 12410614748361223688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2491045438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491045439) 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 11 ways as a sum of consecutive naturals, for example, 2481 + ... + 70627.

It is an arithmetic number, because the mean of its divisors is an integer number (181597383).

Almost surely, 2^2491045438 is an apocalyptic number.

2491045438 is a deficient number, since it is larger than the sum of its proper divisors (1867291754).

2491045438 is a wasteful number, since it uses less digits than its factorization.

2491045438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68536 (or 68529 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 2491045438 is about 49910.3740518943. The cubic root of 2491045438 is about 1355.5864416858.

The spelling of 2491045438 in words is "two billion, four hundred ninety-one million, forty-five thousand, four hundred thirty-eight".