405252569 has 4 divisors (see below), whose sum is σ = 415136820. Its totient is φ = 395368320.

The previous prime is 405252559. The next prime is 405252581. The reversal of 405252569 is 965252504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101203600 + 304048969 = 10060^2 + 17437^2 .

It is a cyclic number.

It is not a de Polignac number, because 405252569 - 2⁸ = 405252313 is a prime.

It is a super-2 number, since 2×405252569² = 328459289362199522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405252559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4942064 + ... + 4942145.

It is an arithmetic number, because the mean of its divisors is an integer number (103784205).

Almost surely, 2^405252569 is an apocalyptic number.

It is an amenable number.

405252569 is a deficient number, since it is larger than the sum of its proper divisors (9884251).

405252569 is an equidigital number, since it uses as much as digits as its factorization.

405252569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9884250.

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 405252569 is about 20130.8859467238. The cubic root of 405252569 is about 740.0173900223.

The spelling of 405252569 in words is "four hundred five million, two hundred fifty-two thousand, five hundred sixty-nine".