38188889 has 2 divisors, whose sum is σ = 38188890. Its totient is φ = 38188888.

The previous prime is 38188873. The next prime is 38188907. The reversal of 38188889 is 98888183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37393225 + 795664 = 6115^2 + 892^2 .

It is an emirp because it is prime and its reverse (98888183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38188889 - 2⁴ = 38188873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38188889.

It is not a weakly prime, because it can be changed into another prime (38188819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19094444 + 19094445.

It is an arithmetic number, because the mean of its divisors is an integer number (19094445).

Almost surely, 2^38188889 is an apocalyptic number.

It is an amenable number.

38188889 is a deficient number, since it is larger than the sum of its proper divisors (1).

38188889 is an equidigital number, since it uses as much as digits as its factorization.

38188889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 884736, while the sum is 53.

The square root of 38188889 is about 6179.7159319826. The cubic root of 38188889 is about 336.7536730109.

The spelling of 38188889 in words is "thirty-eight million, one hundred eighty-eight thousand, eight hundred eighty-nine".