3967865386 has 4 divisors (see below), whose sum is σ = 5951798082. Its totient is φ = 1983932692.

The previous prime is 3967865383. The next prime is 3967865387. The reversal of 3967865386 is 6835687693.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6835687693 = 3301 ⋅2070793.

It can be written as a sum of positive squares in only one way, i.e., 3967110225 + 755161 = 62985^2 + 869^2 .

It is not an unprimeable number, because it can be changed into a prime (3967865383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991966345 + ... + 991966348.

Almost surely, 2^3967865386 is an apocalyptic number.

3967865386 is a deficient number, since it is larger than the sum of its proper divisors (1983932696).

3967865386 is a wasteful number, since it uses less digits than its factorization.

3967865386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983932695.

The product of its digits is 39191040, while the sum is 61.

The square root of 3967865386 is about 62990.9944833386. The cubic root of 3967865386 is about 1583.1387408599.

The spelling of 3967865386 in words is "three billion, nine hundred sixty-seven million, eight hundred sixty-five thousand, three hundred eighty-six".