1378444388 has 48 divisors (see below), whose sum is σ = 2692859904. Its totient is φ = 614353920.

The previous prime is 1378444387. The next prime is 1378444393. The reversal of 1378444388 is 8834448731.

It is not an unprimeable number, because it can be changed into a prime (1378444387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92120 + ... + 106032.

It is an arithmetic number, because the mean of its divisors is an integer number (56101248).

Almost surely, 2^1378444388 is an apocalyptic number.

It is an amenable number.

1378444388 is a deficient number, since it is larger than the sum of its proper divisors (1314415516).

1378444388 is a wasteful number, since it uses less digits than its factorization.

1378444388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14012 (or 14010 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 50.

The square root of 1378444388 is about 37127.4075044299. The cubic root of 1378444388 is about 1112.9177862410.

The spelling of 1378444388 in words is "one billion, three hundred seventy-eight million, four hundred forty-four thousand, three hundred eighty-eight".