401265505 has 4 divisors (see below), whose sum is σ = 481518612. Its totient is φ = 321012400.

The previous prime is 401265499. The next prime is 401265533. The reversal of 401265505 is 505562104.

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 281165824 + 120099681 = 16768^2 + 10959^2 .

It is not a de Polignac number, because 401265505 - 2³ = 401265497 is a prime.

It is a super-2 number, since 2×401265505² = 322028011005810050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40126546 + ... + 40126555.

It is an arithmetic number, because the mean of its divisors is an integer number (120379653).

Almost surely, 2^401265505 is an apocalyptic number.

It is an amenable number.

401265505 is a deficient number, since it is larger than the sum of its proper divisors (80253107).

401265505 is an equidigital number, since it uses as much as digits as its factorization.

401265505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80253106.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 401265505 is about 20031.6126410232. The cubic root of 401265505 is about 737.5825084363.

The spelling of 401265505 in words is "four hundred one million, two hundred sixty-five thousand, five hundred five".