1398189540 has 96 divisors (see below), whose sum is σ = 4340972160. Its totient is φ = 333388800.

The previous prime is 1398189523. The next prime is 1398189547. The reversal of 1398189540 is 459818931.

It is a self number, because there is not a number n which added to its sum of digits gives 1398189540.

It is not an unprimeable number, because it can be changed into a prime (1398189547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22896 + ... + 57624.

It is an arithmetic number, because the mean of its divisors is an integer number (45218460).

Almost surely, 2^1398189540 is an apocalyptic number.

1398189540 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 1398189540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2170486080).

1398189540 is an abundant number, since it is smaller than the sum of its proper divisors (2942782620).

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

1398189540 is a wasteful number, since it uses less digits than its factorization.

1398189540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34813 (or 34811 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 1398189540 is about 37392.3727516722. The cubic root of 1398189540 is about 1118.2065098772.

The spelling of 1398189540 in words is "one billion, three hundred ninety-eight million, one hundred eighty-nine thousand, five hundred forty".