405052521 has 16 divisors (see below), whose sum is σ = 546481728. Its totient is φ = 266840000.

The previous prime is 405052519. The next prime is 405052537. The reversal of 405052521 is 125250504.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 405052521 - 2¹ = 405052519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 405052491 and 405052500.

It is not an unprimeable number, because it can be changed into a prime (405052121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211450 + ... + 213356.

It is an arithmetic number, because the mean of its divisors is an integer number (34155108).

Almost surely, 2^405052521 is an apocalyptic number.

It is an amenable number.

405052521 is a deficient number, since it is larger than the sum of its proper divisors (141429207).

405052521 is a wasteful number, since it uses less digits than its factorization.

405052521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2712.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 405052521 is about 20125.9166499317. The cubic root of 405052521 is about 739.8956031203.

The spelling of 405052521 in words is "four hundred five million, fifty-two thousand, five hundred twenty-one".