1378351280 has 40 divisors (see below), whose sum is σ = 3206422752. Its totient is φ = 551038464.

The previous prime is 1378351267. The next prime is 1378351297. The reversal of 1378351280 is 821538731.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194357 + ... + 201323.

Almost surely, 2^1378351280 is an apocalyptic number.

1378351280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1378351280 is an abundant number, since it is smaller than the sum of its proper divisors (1828071472).

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

1378351280 is a wasteful number, since it uses less digits than its factorization.

1378351280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9453 (or 9447 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 1378351280 is about 37126.1535847709. The cubic root of 1378351280 is about 1112.8927280708.

The spelling of 1378351280 in words is "one billion, three hundred seventy-eight million, three hundred fifty-one thousand, two hundred eighty".