1000240391 has 2 divisors, whose sum is σ = 1000240392. Its totient is φ = 1000240390.

The previous prime is 1000240349. The next prime is 1000240447. The reversal of 1000240391 is 1930420001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000240391 - 2¹⁰ = 1000239367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000240291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500120195 + 500120196.

It is an arithmetic number, because the mean of its divisors is an integer number (500120196).

Almost surely, 2^1000240391 is an apocalyptic number.

1000240391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000240391 is an equidigital number, since it uses as much as digits as its factorization.

1000240391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1000240391 is about 31626.5772887298. The cubic root of 1000240391 is about 1000.0801239133.

Adding to 1000240391 its reverse (1930420001), we get a palindrome (2930660392).

The spelling of 1000240391 in words is "one billion, two hundred forty thousand, three hundred ninety-one".