130565840 has 40 divisors (see below), whose sum is σ = 304051968. Its totient is φ = 52142720.

The previous prime is 130565839. The next prime is 130565843. The reversal of 130565840 is 48565031.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 130565797 and 130565806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130565843) 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, 81689 + ... + 83271.

Almost surely, 2^130565840 is an apocalyptic number.

130565840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

130565840 is an abundant number, since it is smaller than the sum of its proper divisors (173486128).

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

130565840 is a wasteful number, since it uses less digits than its factorization.

130565840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2627 (or 2621 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 130565840 is about 11426.5410339262. The cubic root of 130565840 is about 507.3136203176.

The spelling of 130565840 in words is "one hundred thirty million, five hundred sixty-five thousand, eight hundred forty".