387442831 has 2 divisors, whose sum is σ = 387442832. Its totient is φ = 387442830.

The previous prime is 387442829. The next prime is 387442841. The reversal of 387442831 is 138244783.

It is a weak prime.

It is an emirp because it is prime and its reverse (138244783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 387442831 - 2¹ = 387442829 is a prime.

It is a super-2 number, since 2×387442831² = 300223894586589122, which contains 22 as substring.

Together with 387442829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387442841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193721415 + 193721416.

It is an arithmetic number, because the mean of its divisors is an integer number (193721416).

Almost surely, 2^387442831 is an apocalyptic number.

387442831 is a deficient number, since it is larger than the sum of its proper divisors (1).

387442831 is an equidigital number, since it uses as much as digits as its factorization.

387442831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 40.

The square root of 387442831 is about 19683.5675374156. The cubic root of 387442831 is about 729.0140132022.

The spelling of 387442831 in words is "three hundred eighty-seven million, four hundred forty-two thousand, eight hundred thirty-one".