1539978616 has 72 divisors (see below), whose sum is σ = 3324452040. Its totient is φ = 667010080.

The previous prime is 1539978607. The next prime is 1539978667. The reversal of 1539978616 is 6168799351.

It is a happy number.

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 17 ways as a sum of consecutive naturals, for example, 5855301 + ... + 5855563.

It is an arithmetic number, because the mean of its divisors is an integer number (46172945).

Almost surely, 2^1539978616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1539978616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1662226020).

1539978616 is an abundant number, since it is smaller than the sum of its proper divisors (1784473424).

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

1539978616 is a wasteful number, since it uses less digits than its factorization.

1539978616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577 (or 299 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 55.

The square root of 1539978616 is about 39242.5612823628. The cubic root of 1539978616 is about 1154.7950051909.

The spelling of 1539978616 in words is "one billion, five hundred thirty-nine million, nine hundred seventy-eight thousand, six hundred sixteen".