1378585123 has 4 divisors (see below), whose sum is σ = 1378769040. Its totient is φ = 1378401208.

The previous prime is 1378585081. The next prime is 1378585141. The reversal of 1378585123 is 3215858731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1378585123 - 2⁹ = 1378584611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1378585123.

It is not an unprimeable number, because it can be changed into a prime (1378585163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80215 + ... + 95872.

It is an arithmetic number, because the mean of its divisors is an integer number (344692260).

Almost surely, 2^1378585123 is an apocalyptic number.

1378585123 is a deficient number, since it is larger than the sum of its proper divisors (183917).

1378585123 is an equidigital number, since it uses as much as digits as its factorization.

1378585123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183916.

The product of its digits is 201600, while the sum is 43.

The square root of 1378585123 is about 37129.3027540243. The cubic root of 1378585123 is about 1112.9556601313.

The spelling of 1378585123 in words is "one billion, three hundred seventy-eight million, five hundred eighty-five thousand, one hundred twenty-three".