3978082477 has 2 divisors, whose sum is σ = 3978082478. Its totient is φ = 3978082476.

The previous prime is 3978082469. The next prime is 3978082483. The reversal of 3978082477 is 7742808793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3620910276 + 357172201 = 60174^2 + 18899^2 .

It is a cyclic number.

It is not a de Polignac number, because 3978082477 - 2³ = 3978082469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3978082447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989041238 + 1989041239.

It is an arithmetic number, because the mean of its divisors is an integer number (1989041239).

Almost surely, 2^3978082477 is an apocalyptic number.

It is an amenable number.

3978082477 is a deficient number, since it is larger than the sum of its proper divisors (1).

3978082477 is an equidigital number, since it uses as much as digits as its factorization.

3978082477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4741632, while the sum is 55.

The square root of 3978082477 is about 63072.0419599683. The cubic root of 3978082477 is about 1584.4964153651.

The spelling of 3978082477 in words is "three billion, nine hundred seventy-eight million, eighty-two thousand, four hundred seventy-seven".