131234440 has 32 divisors (see below), whose sum is σ = 302483160. Its totient is φ = 51212800.

The previous prime is 131234437. The next prime is 131234443. The reversal of 131234440 is 44432131.

It is an interprime number because it is at equal distance from previous prime (131234437) and next prime (131234443).

It can be written as a sum of positive squares in 4 ways, for example, as 30713764 + 100520676 = 5542^2 + 10026^2 .

It is a super-2 number, since 2×131234440² = 34444956484227200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131234443) 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, 38371 + ... + 41650.

Almost surely, 2^131234440 is an apocalyptic number.

131234440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131234440 is an abundant number, since it is smaller than the sum of its proper divisors (171248720).

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

131234440 is a wasteful number, since it uses less digits than its factorization.

131234440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80073 (or 80069 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 131234440 is about 11455.7601231869. The cubic root of 131234440 is about 508.1780949124.

Adding to 131234440 its reverse (44432131), we get a palindrome (175666571).

The spelling of 131234440 in words is "one hundred thirty-one million, two hundred thirty-four thousand, four hundred forty".