1043400565 has 8 divisors (see below), whose sum is σ = 1254572928. Its totient is φ = 833058960.

The previous prime is 1043400563. The next prime is 1043400587. The reversal of 1043400565 is 5650043401.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1043400565 - 2¹ = 1043400563 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 (1043400563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204921 + ... + 209950.

It is an arithmetic number, because the mean of its divisors is an integer number (156821616).

Almost surely, 2^1043400565 is an apocalyptic number.

It is an amenable number.

1043400565 is a deficient number, since it is larger than the sum of its proper divisors (211172363).

1043400565 is an equidigital number, since it uses as much as digits as its factorization.

1043400565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415379.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1043400565 is about 32301.7114871643. The cubic root of 1043400565 is about 1014.2624698719.

Adding to 1043400565 its reverse (5650043401), we get a palindrome (6693443966).

The spelling of 1043400565 in words is "one billion, forty-three million, four hundred thousand, five hundred sixty-five".