38491889 has 2 divisors, whose sum is σ = 38491890. Its totient is φ = 38491888.

The previous prime is 38491879. The next prime is 38491897. The reversal of 38491889 is 98819483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29593600 + 8898289 = 5440^2 + 2983^2 .

It is a cyclic number.

It is not a de Polignac number, because 38491889 - 2²⁰ = 37443313 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (38491819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19245944 + 19245945.

It is an arithmetic number, because the mean of its divisors is an integer number (19245945).

Almost surely, 2^38491889 is an apocalyptic number.

It is an amenable number.

38491889 is a deficient number, since it is larger than the sum of its proper divisors (1).

38491889 is an equidigital number, since it uses as much as digits as its factorization.

38491889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 50.

The square root of 38491889 is about 6204.1831855612. The cubic root of 38491889 is about 337.6419565610.

The spelling of 38491889 in words is "thirty-eight million, four hundred ninety-one thousand, eight hundred eighty-nine".