38219891 has 2 divisors, whose sum is σ = 38219892. Its totient is φ = 38219890.

The previous prime is 38219879. The next prime is 38219917. The reversal of 38219891 is 19891283.

It is a weak prime.

It is an emirp because it is prime and its reverse (19891283) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38219891 - 2¹⁸ = 37957747 is a prime.

It is not a weakly prime, because it can be changed into another prime (38219821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19109945 + 19109946.

It is an arithmetic number, because the mean of its divisors is an integer number (19109946).

Almost surely, 2^38219891 is an apocalyptic number.

38219891 is a deficient number, since it is larger than the sum of its proper divisors (1).

38219891 is an equidigital number, since it uses as much as digits as its factorization.

38219891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 41.

The square root of 38219891 is about 6182.2237908377. The cubic root of 38219891 is about 336.8447746709.

The spelling of 38219891 in words is "thirty-eight million, two hundred nineteen thousand, eight hundred ninety-one".