3974521385 has 8 divisors (see below), whose sum is σ = 4804239816. Its totient is φ = 3156407680.

The previous prime is 3974521373. The next prime is 3974521387. The reversal of 3974521385 is 5831254793.

3974521385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 919969561 + 3054551824 = 30331^2 + 55268^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3974521385 - 2⁶ = 3974521321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3974521387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2900426 + ... + 2901795.

It is an arithmetic number, because the mean of its divisors is an integer number (600529977).

Almost surely, 2^3974521385 is an apocalyptic number.

It is an amenable number.

3974521385 is a deficient number, since it is larger than the sum of its proper divisors (829718431).

3974521385 is a wasteful number, since it uses less digits than its factorization.

3974521385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5802363.

The product of its digits is 907200, while the sum is 47.

The square root of 3974521385 is about 63043.8052864831. The cubic root of 3974521385 is about 1584.0234720923.

The spelling of 3974521385 in words is "three billion, nine hundred seventy-four million, five hundred twenty-one thousand, three hundred eighty-five".