384156381 has 16 divisors (see below), whose sum is σ = 592793600. Its totient is φ = 216738288.

The previous prime is 384156343. The next prime is 384156389. The reversal of 384156381 is 183651483.

It is not a de Polignac number, because 384156381 - 2⁶ = 384156317 is a prime.

It is a super-2 number, since 2×384156381² = 295152250126034322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384156389) 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 in 15 ways as a sum of consecutive naturals, for example, 114121 + ... + 117438.

It is an arithmetic number, because the mean of its divisors is an integer number (37049600).

Almost surely, 2^384156381 is an apocalyptic number.

It is an amenable number.

384156381 is a deficient number, since it is larger than the sum of its proper divisors (208637219).

384156381 is a wasteful number, since it uses less digits than its factorization.

384156381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231648.

The product of its digits is 69120, while the sum is 39.

The square root of 384156381 is about 19599.9076783540. The cubic root of 384156381 is about 726.9468914974.

The spelling of 384156381 in words is "three hundred eighty-four million, one hundred fifty-six thousand, three hundred eighty-one".