1398821280 has 48 divisors (see below), whose sum is σ = 4406288544. Its totient is φ = 373018880.

The previous prime is 1398821279. The next prime is 1398821299. The reversal of 1398821280 is 821288931.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1456626 + ... + 1457585.

It is an arithmetic number, because the mean of its divisors is an integer number (91797678).

Almost surely, 2^1398821280 is an apocalyptic number.

1398821280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1398821280 is an abundant number, since it is smaller than the sum of its proper divisors (3007467264).

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

1398821280 is a wasteful number, since it uses less digits than its factorization.

1398821280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2914229 (or 2914221 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 1398821280 is about 37400.8192423642. The cubic root of 1398821280 is about 1118.3748965407.

The spelling of 1398821280 in words is "one billion, three hundred ninety-eight million, eight hundred twenty-one thousand, two hundred eighty".