38631919 has 2 divisors, whose sum is σ = 38631920. Its totient is φ = 38631918.

The previous prime is 38631917. The next prime is 38631941. The reversal of 38631919 is 91913683.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38631919 - 2¹ = 38631917 is a prime.

It is a super-2 number, since 2×38631919² = 2984850331245122, which contains 22 as substring.

Together with 38631917, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38631911) 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, 19315959 + 19315960.

It is an arithmetic number, because the mean of its divisors is an integer number (19315960).

Almost surely, 2^38631919 is an apocalyptic number.

38631919 is a deficient number, since it is larger than the sum of its proper divisors (1).

38631919 is an equidigital number, since it uses as much as digits as its factorization.

38631919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 40.

The square root of 38631919 is about 6215.4580683969. The cubic root of 38631919 is about 338.0508979990.

The spelling of 38631919 in words is "thirty-eight million, six hundred thirty-one thousand, nine hundred nineteen".