3908121856377 has 4 divisors (see below), whose sum is σ = 5210829141840. Its totient is φ = 2605414570916.

The previous prime is 3908121856339. The next prime is 3908121856381. The reversal of 3908121856377 is 7736581218093.

It is a happy number.

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 3908121856377 - 2¹⁰ = 3908121855353 is a prime.

It is a super-2 number, since 2×3908121856377² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3908121856377.

It is not an unprimeable number, because it can be changed into a prime (3908121856277) 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, 651353642727 + ... + 651353642732.

It is an arithmetic number, because the mean of its divisors is an integer number (1302707285460).

Almost surely, 2^{3908121856377} is an apocalyptic number.

It is an amenable number.

3908121856377 is a deficient number, since it is larger than the sum of its proper divisors (1302707285463).

3908121856377 is a wasteful number, since it uses less digits than its factorization.

3908121856377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302707285462.

The product of its (nonzero) digits is 15240960, while the sum is 60.

The spelling of 3908121856377 in words is "three trillion, nine hundred eight billion, one hundred twenty-one million, eight hundred fifty-six thousand, three hundred seventy-seven".