1665072238 has 16 divisors (see below), whose sum is σ = 2568000960. Its totient is φ = 809222400.

The previous prime is 1665072223. The next prime is 1665072251. The reversal of 1665072238 is 8322705661.

It is a self number, because there is not a number n which added to its sum of digits gives 1665072238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15243 + ... + 59686.

It is an arithmetic number, because the mean of its divisors is an integer number (160500060).

Almost surely, 2^1665072238 is an apocalyptic number.

1665072238 is a deficient number, since it is larger than the sum of its proper divisors (902928722).

1665072238 is a wasteful number, since it uses less digits than its factorization.

1665072238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75243.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 1665072238 is about 40805.2966905033. The cubic root of 1665072238 is about 1185.2529000247.

Adding to 1665072238 its reverse (8322705661), we get a palindrome (9987777899).

It can be divided in two parts, 16650 and 72238, that added together give a palindrome (88888).

The spelling of 1665072238 in words is "one billion, six hundred sixty-five million, seventy-two thousand, two hundred thirty-eight".