1165121438 has 32 divisors (see below), whose sum is σ = 1900547712. Its totient is φ = 532512000.

The previous prime is 1165121437. The next prime is 1165121459. The reversal of 1165121438 is 8341215611.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165121437) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1938338 + ... + 1938938.

It is an arithmetic number, because the mean of its divisors is an integer number (59392116).

Almost surely, 2^1165121438 is an apocalyptic number.

1165121438 is a deficient number, since it is larger than the sum of its proper divisors (735426274).

1165121438 is a wasteful number, since it uses less digits than its factorization.

1165121438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220.

The product of its digits is 5760, while the sum is 32.

The square root of 1165121438 is about 34133.8752268183. The cubic root of 1165121438 is about 1052.2616218870.

The spelling of 1165121438 in words is "one billion, one hundred sixty-five million, one hundred twenty-one thousand, four hundred thirty-eight".