1138040491 has 4 divisors (see below), whose sum is σ = 1300617712. Its totient is φ = 975463272.

The previous prime is 1138040479. The next prime is 1138040509. The reversal of 1138040491 is 1940408311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1940408311 = 34589 ⋅56099.

It is not a de Polignac number, because 1138040491 - 2⁷ = 1138040363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1138040441) 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 3 ways as a sum of consecutive naturals, for example, 81288600 + ... + 81288613.

It is an arithmetic number, because the mean of its divisors is an integer number (325154428).

Almost surely, 2^1138040491 is an apocalyptic number.

1138040491 is a deficient number, since it is larger than the sum of its proper divisors (162577221).

1138040491 is an equidigital number, since it uses as much as digits as its factorization.

1138040491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162577220.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1138040491 is about 33734.8557281634. The cubic root of 1138040491 is about 1044.0450487135.

The spelling of 1138040491 in words is "one billion, one hundred thirty-eight million, forty thousand, four hundred ninety-one".