3985280642 has 30 divisors (see below), whose sum is σ = 6981489699. Its totient is φ = 1706102580.

The previous prime is 3985280639. The next prime is 3985280669. The reversal of 3985280642 is 2460825893.

It can be written as a sum of positive squares in only one way, i.e., 1992640321 + 1992640321 = 44639^2 + 44639^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=44639.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 4374167 + ... + 4375077.

Almost surely, 2^3985280642 is an apocalyptic number.

3985280642 is a deficient number, since it is larger than the sum of its proper divisors (2996209057).

3985280642 is an frugal number, since it uses more digits than its factorization.

3985280642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852 (or 920 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 47.

The square root of 3985280642 is about 63129.0792107726. The cubic root of 3985280642 is about 1585.4515316707.

The spelling of 3985280642 in words is "three billion, nine hundred eighty-five million, two hundred eighty thousand, six hundred forty-two".