3861387 has 6 divisors (see below), whose sum is σ = 5577572. Its totient is φ = 2574252.

The previous prime is 3861383. The next prime is 3861413. The reversal of 3861387 is 7831683.

3861387 is a `hidden beast` number, since 38 + 613 + 8 + 7 = 666.

It is not a de Polignac number, because 3861387 - 2² = 3861383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3861383) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214513 + ... + 214530.

Almost surely, 2^3861387 is an apocalyptic number.

3861387 is a deficient number, since it is larger than the sum of its proper divisors (1716185).

3861387 is a wasteful number, since it uses less digits than its factorization.

3861387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429049 (or 429046 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 3861387 is about 1965.0412209417. The cubic root of 3861387 is about 156.8848872887.

It can be divided in two parts, 38 and 61387, that added together give a triangular number (61425 = T₃₅₀).

The spelling of 3861387 in words is "three million, eight hundred sixty-one thousand, three hundred eighty-seven".