405265109 has 4 divisors (see below), whose sum is σ = 405837420. Its totient is φ = 404692800.

The previous prime is 405265103. The next prime is 405265141. The reversal of 405265109 is 901562504.

It is a happy number.

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 17056900 + 388208209 = 4130^2 + 19703^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405265109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405265103) 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, 285092 + ... + 286509.

It is an arithmetic number, because the mean of its divisors is an integer number (101459355).

Almost surely, 2^405265109 is an apocalyptic number.

It is an amenable number.

405265109 is a deficient number, since it is larger than the sum of its proper divisors (572311).

405265109 is an equidigital number, since it uses as much as digits as its factorization.

405265109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572310.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 405265109 is about 20131.1974060164. The cubic root of 405265109 is about 740.0250228938.

The spelling of 405265109 in words is "four hundred five million, two hundred sixty-five thousand, one hundred nine".