405542052 has 60 divisors (see below), whose sum is σ = 1088852380. Its totient is φ = 131523264.

The previous prime is 405542051. The next prime is 405542063. The reversal of 405542052 is 250245504.

405542052 is a `hidden beast` number, since 40 + 554 + 20 + 52 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 331822656 + 73719396 = 18216^2 + 8586^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (405542051) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4927 + ... + 28902.

Almost surely, 2^405542052 is an apocalyptic number.

It is an amenable number.

405542052 is an abundant number, since it is smaller than the sum of its proper divisors (683310328).

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

405542052 is a wasteful number, since it uses less digits than its factorization.

405542052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33882 (or 33871 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 405542052 is about 20138.0746845372. The cubic root of 405542052 is about 740.1935529738.

Adding to 405542052 its reverse (250245504), we get a palindrome (655787556).

The spelling of 405542052 in words is "four hundred five million, five hundred forty-two thousand, fifty-two".