3978348657 has 8 divisors (see below), whose sum is σ = 5305848576. Its totient is φ = 2651540592.

The previous prime is 3978348641. The next prime is 3978348667. The reversal of 3978348657 is 7568438793.

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

It is not a de Polignac number, because 3978348657 - 2⁴ = 3978348641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3978348657.

It is not an unprimeable number, because it can be changed into a prime (3978348667) 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, 159393 + ... + 182654.

It is an arithmetic number, because the mean of its divisors is an integer number (663231072).

Almost surely, 2^3978348657 is an apocalyptic number.

It is an amenable number.

3978348657 is a deficient number, since it is larger than the sum of its proper divisors (1327499919).

3978348657 is a wasteful number, since it uses less digits than its factorization.

3978348657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345927.

The product of its digits is 30481920, while the sum is 60.

The square root of 3978348657 is about 63074.1520513752. The cubic root of 3978348657 is about 1584.5317549918.

The spelling of 3978348657 in words is "three billion, nine hundred seventy-eight million, three hundred forty-eight thousand, six hundred fifty-seven".