1398539658240 has 704 divisors, whose sum is σ = 5279294880000. Its totient is φ = 349888315392.

The previous prime is 1398539658239. The next prime is 1398539658251. The reversal of 1398539658240 is 428569358931.

1398539658240 is a `hidden beast` number, since 1 + 3 + 9 + 8 + 5 + 3 + 9 + 6 + 582 + 40 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 932981011 + ... + 932982509.

Almost surely, 2^{1398539658240} is an apocalyptic number.

1398539658240 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 1398539658240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2639647440000).

1398539658240 is an abundant number, since it is smaller than the sum of its proper divisors (3880755221760).

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

1398539658240 is a wasteful number, since it uses less digits than its factorization.

1398539658240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947 (or 1923 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 63.

The spelling of 1398539658240 in words is "one trillion, three hundred ninety-eight billion, five hundred thirty-nine million, six hundred fifty-eight thousand, two hundred forty".