231840306 has 20 divisors (see below), whose sum is σ = 519494382. Its totient is φ = 77280048.

The previous prime is 231840269. The next prime is 231840307. The reversal of 231840306 is 603048132.

It is a happy number.

231840306 is a `hidden beast` number, since 2 + 318 + 40 + 306 = 666.

231840306 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 221861025 + 9979281 = 14895^2 + 3159^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 231840306.

It is not an unprimeable number, because it can be changed into a prime (231840307) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 715395 + ... + 715718.

Almost surely, 2^231840306 is an apocalyptic number.

231840306 is an abundant number, since it is smaller than the sum of its proper divisors (287654076).

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

231840306 is a wasteful number, since it uses less digits than its factorization.

231840306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431127 (or 1431118 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 231840306 is about 15226.3030969438. The cubic root of 231840306 is about 614.3223469822.

Adding to 231840306 its reverse (603048132), we get a palindrome (834888438).

It can be divided in two parts, 2318 and 40306, that added together give a palindrome (42624).

The spelling of 231840306 in words is "two hundred thirty-one million, eight hundred forty thousand, three hundred six".