1389517280 has 24 divisors (see below), whose sum is σ = 3282734952. Its totient is φ = 555806848.

The previous prime is 1389517273. The next prime is 1389517303. The reversal of 1389517280 is 827159831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4342082 + ... + 4342401.

It is an arithmetic number, because the mean of its divisors is an integer number (136780623).

Almost surely, 2^1389517280 is an apocalyptic number.

1389517280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1389517280 is an abundant number, since it is smaller than the sum of its proper divisors (1893217672).

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

1389517280 is an equidigital number, since it uses as much as digits as its factorization.

1389517280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8684498 (or 8684490 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 1389517280 is about 37276.2294230519. The cubic root of 1389517280 is about 1115.8898243859.

The spelling of 1389517280 in words is "one billion, three hundred eighty-nine million, five hundred seventeen thousand, two hundred eighty".