3978520693 has 16 divisors (see below), whose sum is σ = 4821811200. Its totient is φ = 3204585216.

The previous prime is 3978520639. The next prime is 3978520699. The reversal of 3978520693 is 3960258793.

It is not a de Polignac number, because 3978520693 - 2¹³ = 3978512501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3978520693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978520699) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 52108 + ... + 103306.

It is an arithmetic number, because the mean of its divisors is an integer number (301363200).

Almost surely, 2^3978520693 is an apocalyptic number.

It is an amenable number.

3978520693 is a deficient number, since it is larger than the sum of its proper divisors (843290507).

3978520693 is a wasteful number, since it uses less digits than its factorization.

3978520693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51876.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The square root of 3978520693 is about 63075.5157965434. The cubic root of 3978520693 is about 1584.5545946672.

The spelling of 3978520693 in words is "three billion, nine hundred seventy-eight million, five hundred twenty thousand, six hundred ninety-three".