1038397891 has 2 divisors, whose sum is σ = 1038397892. Its totient is φ = 1038397890.

The previous prime is 1038397873. The next prime is 1038397897. The reversal of 1038397891 is 1987938301.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1038397891 - 2¹¹ = 1038395843 is a prime.

It is not a weakly prime, because it can be changed into another prime (1038397897) 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 as a sum of consecutive naturals, namely, 519198945 + 519198946.

It is an arithmetic number, because the mean of its divisors is an integer number (519198946).

Almost surely, 2^1038397891 is an apocalyptic number.

1038397891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1038397891 is an equidigital number, since it uses as much as digits as its factorization.

1038397891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 1038397891 is about 32224.1817739411. The cubic root of 1038397891 is about 1012.6388826610.

The spelling of 1038397891 in words is "one billion, thirty-eight million, three hundred ninety-seven thousand, eight hundred ninety-one".