400242565 has 4 divisors (see below), whose sum is σ = 480291084. Its totient is φ = 320194048.

The previous prime is 400242559. The next prime is 400242587. The reversal of 400242565 is 565242004.

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 84327489 + 315915076 = 9183^2 + 17774^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400242565 is a prime.

It is a super-2 number, since 2×400242565² = 320388221675558450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 40024252 + ... + 40024261.

It is an arithmetic number, because the mean of its divisors is an integer number (120072771).

Almost surely, 2^400242565 is an apocalyptic number.

It is an amenable number.

400242565 is a deficient number, since it is larger than the sum of its proper divisors (80048519).

400242565 is an equidigital number, since it uses as much as digits as its factorization.

400242565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80048518.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 400242565 is about 20006.0632059383. The cubic root of 400242565 is about 736.9552058160.

Adding to 400242565 its reverse (565242004), we get a palindrome (965484569).

The spelling of 400242565 in words is "four hundred million, two hundred forty-two thousand, five hundred sixty-five".