381969009 has 24 divisors (see below), whose sum is σ = 562723200. Its totient is φ = 249599520.

The previous prime is 381968969. The next prime is 381969017. The reversal of 381969009 is 900969183.

It is not a de Polignac number, because 381969009 - 2⁸ = 381968753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381969109) 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 in 23 ways as a sum of consecutive naturals, for example, 228027 + ... + 229695.

It is an arithmetic number, because the mean of its divisors is an integer number (23446800).

Almost surely, 2^381969009 is an apocalyptic number.

It is an amenable number.

381969009 is a deficient number, since it is larger than the sum of its proper divisors (180754191).

381969009 is a wasteful number, since it uses less digits than its factorization.

381969009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165 (or 2162 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 381969009 is about 19544.0274508608. The cubic root of 381969009 is about 725.5645283643.

The spelling of 381969009 in words is "three hundred eighty-one million, nine hundred sixty-nine thousand, nine".