405257065 has 4 divisors (see below), whose sum is σ = 486308484. Its totient is φ = 324205648.

The previous prime is 405257059. The next prime is 405257093. The reversal of 405257065 is 560752504.

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 217238121 + 188018944 = 14739^2 + 13712^2 .

It is a cyclic number.

It is not a de Polignac number, because 405257065 - 2¹⁷ = 405125993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 405257065.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40525702 + ... + 40525711.

It is an arithmetic number, because the mean of its divisors is an integer number (121577121).

Almost surely, 2^405257065 is an apocalyptic number.

It is an amenable number.

405257065 is a deficient number, since it is larger than the sum of its proper divisors (81051419).

405257065 is an equidigital number, since it uses as much as digits as its factorization.

405257065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81051418.

The product of its (nonzero) digits is 42000, while the sum is 34.

The square root of 405257065 is about 20130.9976156176. The cubic root of 405257065 is about 740.0201266744.

The spelling of 405257065 in words is "four hundred five million, two hundred fifty-seven thousand, sixty-five".