3978500357149 has 4 divisors (see below), whose sum is σ = 3978509357536. Its totient is φ = 3978491356764.

The previous prime is 3978500357147. The next prime is 3978500357173. The reversal of 3978500357149 is 9417530058793.

It is a happy number.

3978500357149 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3978500357149 - 2¹ = 3978500357147 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978500357147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3800919 + ... + 4733284.

It is an arithmetic number, because the mean of its divisors is an integer number (994627339384).

Almost surely, 2^{3978500357149} is an apocalyptic number.

It is an amenable number.

3978500357149 is a deficient number, since it is larger than the sum of its proper divisors (9000387).

3978500357149 is an equidigital number, since it uses as much as digits as its factorization.

3978500357149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9000386.

The product of its (nonzero) digits is 28576800, while the sum is 61.

The spelling of 3978500357149 in words is "three trillion, nine hundred seventy-eight billion, five hundred million, three hundred fifty-seven thousand, one hundred forty-nine".