131623840 has 36 divisors (see below), whose sum is σ = 311304546. Its totient is φ = 52591488.

The previous prime is 131623819. The next prime is 131623853. The reversal of 131623840 is 48326131.

It can be written as a sum of positive squares in only one way, i.e., 118461456 + 13162384 = 10884^2 + 3628^2 .

It is a junction number, because it is equal to n+sod(n) for n = 131623799 and 131623808.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 144667 + ... + 145573.

Almost surely, 2^131623840 is an apocalyptic number.

131623840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131623840 is an abundant number, since it is smaller than the sum of its proper divisors (179680706).

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

131623840 is an frugal number, since it uses more digits than its factorization.

131623840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829 (or 914 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 131623840 is about 11472.7433510909. The cubic root of 131623840 is about 508.6802221247.

Adding to 131623840 its reverse (48326131), we get a palindrome (179949971).

The spelling of 131623840 in words is "one hundred thirty-one million, six hundred twenty-three thousand, eight hundred forty".