1521389142 has 240 divisors, whose sum is σ = 4463296992. Its totient is φ = 383201280.

The previous prime is 1521389123. The next prime is 1521389183. The reversal of 1521389142 is 2419831251.

1521389142 is a `hidden beast` number, since 1 + 521 + 3 + 8 + 91 + 42 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1521389097 and 1521389106.

It is a congruent number.

It is an unprimeable number.

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 119 ways as a sum of consecutive naturals, for example, 2373142 + ... + 2373782.

Almost surely, 2^1521389142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1521389142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2231648496).

1521389142 is an abundant number, since it is smaller than the sum of its proper divisors (2941907850).

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

1521389142 is a wasteful number, since it uses less digits than its factorization.

1521389142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705 (or 689 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 1521389142 is about 39004.9886809367. The cubic root of 1521389142 is about 1150.1295738058.

The spelling of 1521389142 in words is "one billion, five hundred twenty-one million, three hundred eighty-nine thousand, one hundred forty-two".