38991019 has 2 divisors, whose sum is σ = 38991020. Its totient is φ = 38991018.

The previous prime is 38991011. The next prime is 38991031. The reversal of 38991019 is 91019983.

It is a weak prime.

It is an emirp because it is prime and its reverse (91019983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38991019 - 2³ = 38991011 is a prime.

It is a super-2 number, since 2×38991019² = 3040599125316722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38991011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19495509 + 19495510.

It is an arithmetic number, because the mean of its divisors is an integer number (19495510).

Almost surely, 2^38991019 is an apocalyptic number.

38991019 is a deficient number, since it is larger than the sum of its proper divisors (1).

38991019 is an equidigital number, since it uses as much as digits as its factorization.

38991019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 38991019 is about 6244.2789015226. The cubic root of 38991019 is about 339.0951111321.

The spelling of 38991019 in words is "thirty-eight million, nine hundred ninety-one thousand, nineteen".