1378312992 has 72 divisors (see below), whose sum is σ = 4479523776. Its totient is φ = 393803136.

The previous prime is 1378312967. The next prime is 1378313003. The reversal of 1378312992 is 2992138731.

It is a tau number, because it is divible by the number of its divisors (72).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 339828 + ... + 343859.

It is an arithmetic number, because the mean of its divisors is an integer number (62215608).

Almost surely, 2^1378312992 is an apocalyptic number.

1378312992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1378312992 is an abundant number, since it is smaller than the sum of its proper divisors (3101210784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1378312992 is a wasteful number, since it uses less digits than its factorization.

1378312992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683710 (or 683699 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 1378312992 is about 37125.6379339130. The cubic root of 1378312992 is about 1112.8824232881.

The spelling of 1378312992 in words is "one billion, three hundred seventy-eight million, three hundred twelve thousand, nine hundred ninety-two".