3977783517 has 4 divisors (see below), whose sum is σ = 5303711360. Its totient is φ = 2651855676.

The previous prime is 3977783489. The next prime is 3977783597. The reversal of 3977783517 is 7153877793.

3977783517 is digitally balanced in base 2 and base 4, because in such bases 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 not a de Polignac number, because 3977783517 - 2⁷ = 3977783389 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 (3977783597) 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, 662963917 + ... + 662963922.

It is an arithmetic number, because the mean of its divisors is an integer number (1325927840).

Almost surely, 2^3977783517 is an apocalyptic number.

It is an amenable number.

3977783517 is a deficient number, since it is larger than the sum of its proper divisors (1325927843).

3977783517 is a wasteful number, since it uses less digits than its factorization.

3977783517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325927842.

The product of its digits is 7779240, while the sum is 57.

The square root of 3977783517 is about 63069.6719271632. The cubic root of 3977783517 is about 1584.4567217926.

The spelling of 3977783517 in words is "three billion, nine hundred seventy-seven million, seven hundred eighty-three thousand, five hundred seventeen".