131206240 has 96 divisors (see below), whose sum is σ = 341397504. Its totient is φ = 47255040.

The previous prime is 131206223. The next prime is 131206247. The reversal of 131206240 is 42602131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131206247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223227 + ... + 223813.

It is an arithmetic number, because the mean of its divisors is an integer number (3556224).

Almost surely, 2^131206240 is an apocalyptic number.

131206240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131206240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170698752).

131206240 is an abundant number, since it is smaller than the sum of its proper divisors (210191264).

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

131206240 is a wasteful number, since it uses less digits than its factorization.

131206240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740 (or 732 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 131206240 is about 11454.5292351978. The cubic root of 131206240 is about 508.1416927585.

Adding to 131206240 its reverse (42602131), we get a palindrome (173808371).

The spelling of 131206240 in words is "one hundred thirty-one million, two hundred six thousand, two hundred forty".