3951865 has 8 divisors (see below), whose sum is σ = 4763520. Its totient is φ = 3147312.

The previous prime is 3951863. The next prime is 3951869. The reversal of 3951865 is 5681593.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3951865 - 2¹ = 3951863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3951863) 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 in 7 ways as a sum of consecutive naturals, for example, 459 + ... + 2848.

It is an arithmetic number, because the mean of its divisors is an integer number (595440).

Almost surely, 2^3951865 is an apocalyptic number.

It is an amenable number.

3951865 is a deficient number, since it is larger than the sum of its proper divisors (811655).

3951865 is a wasteful number, since it uses less digits than its factorization.

3951865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3551.

The product of its digits is 32400, while the sum is 37.

The square root of 3951865 is about 1987.9298277354. The cubic root of 3951865 is about 158.1007875877.

The spelling of 3951865 in words is "three million, nine hundred fifty-one thousand, eight hundred sixty-five".