231440210 has 32 divisors (see below), whose sum is σ = 444106800. Its totient is φ = 86536192.

The previous prime is 231440207. The next prime is 231440219. The reversal of 231440210 is 12044132.

It can be written as a sum of positive squares in 8 ways, for example, as 20638849 + 210801361 = 4543^2 + 14519^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (231440219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20762 + ... + 29898.

Almost surely, 2^231440210 is an apocalyptic number.

231440210 is a deficient number, since it is larger than the sum of its proper divisors (212666590).

231440210 is a wasteful number, since it uses less digits than its factorization.

231440210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9310.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 231440210 is about 15213.1591065104. The cubic root of 231440210 is about 613.9687566994.

Adding to 231440210 its reverse (12044132), we get a palindrome (243484342).

It can be divided in two parts, 2314 and 40210, that added together give a palindrome (42524).

The spelling of 231440210 in words is "two hundred thirty-one million, four hundred forty thousand, two hundred ten".