405216052 has 12 divisors (see below), whose sum is σ = 709269316. Its totient is φ = 202567680.

The previous prime is 405216041. The next prime is 405216109. The reversal of 405216052 is 250612504.

It can be written as a sum of positive squares in 2 ways, for example, as 276756496 + 128459556 = 16636^2 + 11334^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32308 + ... + 43060.

Almost surely, 2^405216052 is an apocalyptic number.

It is an amenable number.

405216052 is a deficient number, since it is larger than the sum of its proper divisors (304053264).

405216052 is a wasteful number, since it uses less digits than its factorization.

405216052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20178 (or 20176 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 405216052 is about 20129.9789368991. The cubic root of 405216052 is about 739.9951618870.

Adding to 405216052 its reverse (250612504), we get a palindrome (655828556).

The spelling of 405216052 in words is "four hundred five million, two hundred sixteen thousand, fifty-two".