1438265369 has 4 divisors (see below), whose sum is σ = 1477137444. Its totient is φ = 1399393296.

The previous prime is 1438265359. The next prime is 1438265393. The reversal of 1438265369 is 9635628341.

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 1346009344 + 92256025 = 36688^2 + 9605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1438265369 is a prime.

It is a super-2 number, since 2×1438265369² = 4137214543329412322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1438265329) 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, 19435982 + ... + 19436055.

It is an arithmetic number, because the mean of its divisors is an integer number (369284361).

Almost surely, 2^1438265369 is an apocalyptic number.

It is an amenable number.

1438265369 is a deficient number, since it is larger than the sum of its proper divisors (38872075).

1438265369 is an equidigital number, since it uses as much as digits as its factorization.

1438265369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38872074.

The product of its digits is 933120, while the sum is 47.

The square root of 1438265369 is about 37924.4692645790. The cubic root of 1438265369 is about 1128.7896218371.

The spelling of 1438265369 in words is "one billion, four hundred thirty-eight million, two hundred sixty-five thousand, three hundred sixty-nine".