509901540 has 24 divisors (see below), whose sum is σ = 1427724480. Its totient is φ = 135973728.

The previous prime is 509901529. The next prime is 509901593. The reversal of 509901540 is 45109905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4249120 + ... + 4249239.

It is an arithmetic number, because the mean of its divisors is an integer number (59488520).

Almost surely, 2^509901540 is an apocalyptic number.

It is an amenable number.

509901540 is an abundant number, since it is smaller than the sum of its proper divisors (917822940).

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

509901540 is a wasteful number, since it uses less digits than its factorization.

509901540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8498371 (or 8498369 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 509901540 is about 22580.9995350073. Note that the first 3 decimals coincide. The cubic root of 509901540 is about 798.9055555052.

The spelling of 509901540 in words is "five hundred nine million, nine hundred one thousand, five hundred forty".