3961387 has 4 divisors (see below), whose sum is σ = 3997840. Its totient is φ = 3924936.

The previous prime is 3961343. The next prime is 3961393. The reversal of 3961387 is 7831693.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3961387 - 2⁷ = 3961259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3961327) 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, 18063 + ... + 18280.

It is an arithmetic number, because the mean of its divisors is an integer number (999460).

Almost surely, 2^3961387 is an apocalyptic number.

3961387 is a deficient number, since it is larger than the sum of its proper divisors (36453).

3961387 is a wasteful number, since it uses less digits than its factorization.

3961387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36452.

The product of its digits is 27216, while the sum is 37.

The square root of 3961387 is about 1990.3233405655. The cubic root of 3961387 is about 158.2276667702.

The spelling of 3961387 in words is "three million, nine hundred sixty-one thousand, three hundred eighty-seven".