231440404402 has 16 divisors (see below), whose sum is σ = 347657206680. Its totient is φ = 115554721408.

The previous prime is 231440404397. The next prime is 231440404409. The reversal of 231440404402 is 204404044132.

It can be written as a sum of positive squares in 4 ways, for example, as 159407749081 + 72032655321 = 399259^2 + 268389^2 .

It is a super-2 number, since 2×231440404402² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231440404409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13695174 + ... + 13712062.

Almost surely, 2^231440404402 is an apocalyptic number.

231440404402 is a deficient number, since it is larger than the sum of its proper divisors (116216802278).

231440404402 is a wasteful number, since it uses less digits than its factorization.

231440404402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26285.

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 231440404402 its reverse (204404044132), we get a palindrome (435844448534).

The spelling of 231440404402 in words is "two hundred thirty-one billion, four hundred forty million, four hundred four thousand, four hundred two".