231786128 has 20 divisors (see below), whose sum is σ = 513240960. Its totient is φ = 99336864.

The previous prime is 231786091. The next prime is 231786151. The reversal of 231786128 is 821687132.

It is a junction number, because it is equal to n+sod(n) for n = 231786091 and 231786100.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1034648 + ... + 1034871.

It is an arithmetic number, because the mean of its divisors is an integer number (25662048).

Almost surely, 2^231786128 is an apocalyptic number.

231786128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

231786128 is an abundant number, since it is smaller than the sum of its proper divisors (281454832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231786128 is a wasteful number, since it uses less digits than its factorization.

231786128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069534 (or 2069528 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 231786128 is about 15224.5239006019. The cubic root of 231786128 is about 614.2744902634.

The spelling of 231786128 in words is "two hundred thirty-one million, seven hundred eighty-six thousand, one hundred twenty-eight".