387042881 has 2 divisors, whose sum is σ = 387042882. Its totient is φ = 387042880.

The previous prime is 387042841. The next prime is 387042889. The reversal of 387042881 is 188240783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256512256 + 130530625 = 16016^2 + 11425^2 .

It is an emirp because it is prime and its reverse (188240783) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387042881 is a prime.

It is a super-2 number, since 2×387042881² = 299604383465560322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (387042889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193521440 + 193521441.

It is an arithmetic number, because the mean of its divisors is an integer number (193521441).

Almost surely, 2^387042881 is an apocalyptic number.

It is an amenable number.

387042881 is a deficient number, since it is larger than the sum of its proper divisors (1).

387042881 is an equidigital number, since it uses as much as digits as its factorization.

387042881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 387042881 is about 19673.4054245827. The cubic root of 387042881 is about 728.7630776525.

The spelling of 387042881 in words is "three hundred eighty-seven million, forty-two thousand, eight hundred eighty-one".