1389572520 has 512 divisors, whose sum is σ = 5401313280. Its totient is φ = 278691840.

The previous prime is 1389572507. The next prime is 1389572579. The reversal of 1389572520 is 252759831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 19035204 + ... + 19035276.

It is an arithmetic number, because the mean of its divisors is an integer number (10549440).

Almost surely, 2^1389572520 is an apocalyptic number.

1389572520 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 1389572520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2700656640).

1389572520 is an abundant number, since it is smaller than the sum of its proper divisors (4011740760).

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

1389572520 is a wasteful number, since it uses less digits than its factorization.

1389572520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 1389572520 is about 37276.9703704580. The cubic root of 1389572520 is about 1115.9046115205.

The spelling of 1389572520 in words is "one billion, three hundred eighty-nine million, five hundred seventy-two thousand, five hundred twenty".