201287540 has 24 divisors (see below), whose sum is σ = 424359432. Its totient is φ = 80199680.

The previous prime is 201287453. The next prime is 201287543. The reversal of 201287540 is 45782102.

It can be written as a sum of positive squares in 4 ways, for example, as 69588964 + 131698576 = 8342^2 + 11476^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201287543) 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, 14441 + ... + 24720.

It is an arithmetic number, because the mean of its divisors is an integer number (17681643).

Almost surely, 2^201287540 is an apocalyptic number.

201287540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201287540 is an abundant number, since it is smaller than the sum of its proper divisors (223071892).

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

201287540 is a wasteful number, since it uses less digits than its factorization.

201287540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39427 (or 39425 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 201287540 is about 14187.5840085619. The cubic root of 201287540 is about 586.0557942115.

The spelling of 201287540 in words is "two hundred one million, two hundred eighty-seven thousand, five hundred forty".