131420640 has 96 divisors (see below), whose sum is σ = 445840416. Its totient is φ = 32348160.

The previous prime is 131420593. The next prime is 131420647. The reversal of 131420640 is 46024131.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131420647) 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, 4291 + ... + 16770.

It is an arithmetic number, because the mean of its divisors is an integer number (4644171).

Almost surely, 2^131420640 is an apocalyptic number.

131420640 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 131420640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222920208).

131420640 is an abundant number, since it is smaller than the sum of its proper divisors (314419776).

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

131420640 is a wasteful number, since it uses less digits than its factorization.

131420640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21092 (or 21084 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 131420640 is about 11463.8841585215. The cubic root of 131420640 is about 508.4183216018.

Adding to 131420640 its reverse (46024131), we get a palindrome (177444771).

The spelling of 131420640 in words is "one hundred thirty-one million, four hundred twenty thousand, six hundred forty".