231840381 has 8 divisors (see below), whose sum is σ = 309193344. Its totient is φ = 154523840.

The previous prime is 231840377. The next prime is 231840383. The reversal of 231840381 is 183048132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231840381 - 2² = 231840377 is a prime.

It is a super-2 number, since 2×231840381² = 107499924524450322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231840383) 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 7 ways as a sum of consecutive naturals, for example, 14476 + ... + 25946.

It is an arithmetic number, because the mean of its divisors is an integer number (38649168).

Almost surely, 2^231840381 is an apocalyptic number.

It is an amenable number.

231840381 is a deficient number, since it is larger than the sum of its proper divisors (77352963).

231840381 is a wasteful number, since it uses less digits than its factorization.

231840381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18211.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 231840381 is about 15226.3055597870. The cubic root of 231840381 is about 614.3224132264.

It can be divided in two parts, 231840 and 381, that added together give a triangular number (232221 = T₆₈₁).

The spelling of 231840381 in words is "two hundred thirty-one million, eight hundred forty thousand, three hundred eighty-one".