1398539520 has 720 divisors, whose sum is σ = 5983262208. Its totient is φ = 305233920.

The previous prime is 1398539491. The next prime is 1398539521. The reversal of 1398539520 is 259358931.

1398539520 is a `hidden beast` number, since 1 + 3 + 98 + 5 + 39 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398539521) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 29756137 + ... + 29756183.

Almost surely, 2^1398539520 is an apocalyptic number.

1398539520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398539520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2991631104).

1398539520 is an abundant number, since it is smaller than the sum of its proper divisors (4584722688).

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

1398539520 is an equidigital number, since it uses as much as digits as its factorization.

1398539520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 1398539520 is about 37397.0522902541. The cubic root of 1398539520 is about 1118.2998012980.

The spelling of 1398539520 in words is "one billion, three hundred ninety-eight million, five hundred thirty-nine thousand, five hundred twenty".