3951861 has 8 divisors (see below), whose sum is σ = 5348064. Its totient is φ = 2595120.

The previous prime is 3951841. The next prime is 3951863. The reversal of 3951861 is 1681593.

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

It is not a de Polignac number, because 3951861 - 2⁶ = 3951797 is a prime.

It is a Curzon number.

It is a congruent number.

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, 9630 + ... + 10031.

It is an arithmetic number, because the mean of its divisors is an integer number (668508).

Almost surely, 2^3951861 is an apocalyptic number.

It is an amenable number.

3951861 is a deficient number, since it is larger than the sum of its proper divisors (1396203).

3951861 is a wasteful number, since it uses less digits than its factorization.

3951861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19731.

The product of its digits is 6480, while the sum is 33.

The square root of 3951861 is about 1987.9288216634. The cubic root of 3951861 is about 158.1007342455.

The spelling of 3951861 in words is "three million, nine hundred fifty-one thousand, eight hundred sixty-one".