1378194923 has 8 divisors (see below), whose sum is σ = 1607224800. Its totient is φ = 1181309640.

The previous prime is 1378194919. The next prime is 1378194943. The reversal of 1378194923 is 3294918731.

It is not a de Polignac number, because 1378194923 - 2² = 1378194919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378194943) 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, 2008688 + ... + 2009373.

It is an arithmetic number, because the mean of its divisors is an integer number (200903100).

Almost surely, 2^1378194923 is an apocalyptic number.

1378194923 is a deficient number, since it is larger than the sum of its proper divisors (229029877).

1378194923 is an frugal number, since it uses more digits than its factorization.

1378194923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4018082 (or 4018068 counting only the distinct ones).

The product of its digits is 326592, while the sum is 47.

The square root of 1378194923 is about 37124.0477722998. The cubic root of 1378194923 is about 1112.8506451487.

The spelling of 1378194923 in words is "one billion, three hundred seventy-eight million, one hundred ninety-four thousand, nine hundred twenty-three".