1398081520 has 40 divisors (see below), whose sum is σ = 3546045360. Its totient is φ = 508392960.

The previous prime is 1398081511. The next prime is 1398081527. The reversal of 1398081520 is 251808931.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1398081520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398081527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 793485 + ... + 795244.

It is an arithmetic number, because the mean of its divisors is an integer number (88651134).

Almost surely, 2^1398081520 is an apocalyptic number.

1398081520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1398081520 is an abundant number, since it is smaller than the sum of its proper divisors (2147963840).

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

1398081520 is a wasteful number, since it uses less digits than its factorization.

1398081520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588753 (or 1588747 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 1398081520 is about 37390.9283115571. The cubic root of 1398081520 is about 1118.1777126900.

The spelling of 1398081520 in words is "one billion, three hundred ninety-eight million, eighty-one thousand, five hundred twenty".