3855687697 has 4 divisors (see below), whose sum is σ = 3855848116. Its totient is φ = 3855527280.

The previous prime is 3855687653. The next prime is 3855687733. The reversal of 3855687697 is 7967865583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7967865583 = 14389 ⋅553747.

It can be written as a sum of positive squares in 2 ways, for example, as 1831497616 + 2024190081 = 42796^2 + 44991^2 .

It is a cyclic number.

It is not a de Polignac number, because 3855687697 - 2⁷ = 3855687569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3855687607) 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, 36054 + ... + 94927.

It is an arithmetic number, because the mean of its divisors is an integer number (963962029).

Almost surely, 2^3855687697 is an apocalyptic number.

It is an amenable number.

3855687697 is a deficient number, since it is larger than the sum of its proper divisors (160419).

3855687697 is a wasteful number, since it uses less digits than its factorization.

3855687697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160418.

The product of its digits is 76204800, while the sum is 64.

The square root of 3855687697 is about 62094.1840835356. The cubic root of 3855687697 is about 1568.0766332950.

It can be divided in two parts, 38556 and 87697, that added together give a triangular number (126253 = T₅₀₂).

The spelling of 3855687697 in words is "three billion, eight hundred fifty-five million, six hundred eighty-seven thousand, six hundred ninety-seven".