1378638116 has 6 divisors (see below), whose sum is σ = 2412616710. Its totient is φ = 689319056.

The previous prime is 1378638109. The next prime is 1378638133. The reversal of 1378638116 is 6118368731.

It can be written as a sum of positive squares in only one way, i.e., 1284935716 + 93702400 = 35846^2 + 9680^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172329761 + ... + 172329768.

It is an arithmetic number, because the mean of its divisors is an integer number (402102785).

Almost surely, 2^1378638116 is an apocalyptic number.

It is an amenable number.

1378638116 is a deficient number, since it is larger than the sum of its proper divisors (1033978594).

1378638116 is a wasteful number, since it uses less digits than its factorization.

1378638116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344659533 (or 344659531 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 1378638116 is about 37130.0163748954. The cubic root of 1378638116 is about 1112.9699206710.

The spelling of 1378638116 in words is "one billion, three hundred seventy-eight million, six hundred thirty-eight thousand, one hundred sixteen".