105231231440 has 40 divisors (see below), whose sum is σ = 244775300640. Its totient is φ = 42073105536.

The previous prime is 105231231419. The next prime is 105231231467. The reversal of 105231231440 is 44132132501.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×105231231440² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127514 + ... + 476153.

It is an arithmetic number, because the mean of its divisors is an integer number (6119382516).

Almost surely, 2^105231231440 is an apocalyptic number.

105231231440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

105231231440 is an abundant number, since it is smaller than the sum of its proper divisors (139544069200).

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

105231231440 is a wasteful number, since it uses less digits than its factorization.

105231231440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605859 (or 605853 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 105231231440 its reverse (44132132501), we get a palindrome (149363363941).

The spelling of 105231231440 in words is "one hundred five billion, two hundred thirty-one million, two hundred thirty-one thousand, four hundred forty".