1006238391 has 8 divisors (see below), whose sum is σ = 1343708400. Its totient is φ = 669796992.

The previous prime is 1006238329. The next prime is 1006238407. The reversal of 1006238391 is 1938326001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1006238391 - 2¹⁸ = 1005976247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1006234391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254866 + ... + 258783.

It is an arithmetic number, because the mean of its divisors is an integer number (167963550).

Almost surely, 2^1006238391 is an apocalyptic number.

1006238391 is a deficient number, since it is larger than the sum of its proper divisors (337470009).

1006238391 is an equidigital number, since it uses as much as digits as its factorization.

1006238391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514305.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 1006238391 is about 31721.2608671219. The cubic root of 1006238391 is about 1002.0751544221.

The spelling of 1006238391 in words is "one billion, six million, two hundred thirty-eight thousand, three hundred ninety-one".