549387540 has 72 divisors (see below), whose sum is σ = 1794673608. Its totient is φ = 135233280.

The previous prime is 549387539. The next prime is 549387551. The reversal of 549387540 is 45783945.

549387540 is a `hidden beast` number, since 549 + 38 + 75 + 4 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2108304 + 547279236 = 1452^2 + 23394^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115051 + ... + 119730.

Almost surely, 2^549387540 is an apocalyptic number.

It is an amenable number.

549387540 is an abundant number, since it is smaller than the sum of its proper divisors (1245286068).

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

549387540 is a wasteful number, since it uses less digits than its factorization.

549387540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234809 (or 234804 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The square root of 549387540 is about 23439.0174708754. The cubic root of 549387540 is about 819.0170355198.

The spelling of 549387540 in words is "five hundred forty-nine million, three hundred eighty-seven thousand, five hundred forty".