38490187 has 2 divisors, whose sum is σ = 38490188. Its totient is φ = 38490186.

The previous prime is 38490169. The next prime is 38490197. The reversal of 38490187 is 78109483.

It is a strong prime.

It is an emirp because it is prime and its reverse (78109483) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38490187 is a prime.

It is not a weakly prime, because it can be changed into another prime (38490107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19245093 + 19245094.

It is an arithmetic number, because the mean of its divisors is an integer number (19245094).

Almost surely, 2^38490187 is an apocalyptic number.

38490187 is a deficient number, since it is larger than the sum of its proper divisors (1).

38490187 is an equidigital number, since it uses as much as digits as its factorization.

38490187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 38490187 is about 6204.0460185269. The cubic root of 38490187 is about 337.6369799707.

The spelling of 38490187 in words is "thirty-eight million, four hundred ninety thousand, one hundred eighty-seven".