233728381 has 4 divisors (see below), whose sum is σ = 233788000. Its totient is φ = 233668764.

The previous prime is 233728343. The next prime is 233728399. The reversal of 233728381 is 183827332.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 233728381 - 2⁹ = 233727869 is a prime.

It is a super-2 number, since 2×233728381² = 109257912169762322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 233728381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233728301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23481 + ... + 31918.

It is an arithmetic number, because the mean of its divisors is an integer number (58447000).

Almost surely, 2^233728381 is an apocalyptic number.

It is an amenable number.

233728381 is a deficient number, since it is larger than the sum of its proper divisors (59619).

233728381 is an equidigital number, since it uses as much as digits as its factorization.

233728381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59618.

The product of its digits is 48384, while the sum is 37.

The square root of 233728381 is about 15288.1778181705. The cubic root of 233728381 is about 615.9854920474.

The spelling of 233728381 in words is "two hundred thirty-three million, seven hundred twenty-eight thousand, three hundred eighty-one".