1001439656 has 48 divisors (see below), whose sum is σ = 2192613300. Its totient is φ = 427547904.

The previous prime is 1001439613. The next prime is 1001439667. The reversal of 1001439656 is 6569341001.

It can be written as a sum of positive squares in 2 ways, for example, as 730837156 + 270602500 = 27034^2 + 16450^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100700 + ... + 110196.

Almost surely, 2^1001439656 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 1001439656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1096306650).

1001439656 is an abundant number, since it is smaller than the sum of its proper divisors (1191173644).

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

1001439656 is a wasteful number, since it uses less digits than its factorization.

1001439656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9786 (or 9775 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 1001439656 is about 31645.5313749035. The cubic root of 1001439656 is about 1000.4796552274.

The spelling of 1001439656 in words is "one billion, one million, four hundred thirty-nine thousand, six hundred fifty-six".