3985951 has 2 divisors, whose sum is σ = 3985952. Its totient is φ = 3985950.

The previous prime is 3985903. The next prime is 3985999. The reversal of 3985951 is 1595893.

It is a balanced prime because it is at equal distance from previous prime (3985903) and next prime (3985999).

It is a cyclic number.

It is not a de Polignac number, because 3985951 - 2¹⁹ = 3461663 is a prime.

It is an Ulam number.

3985951 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3985351) 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, 1992975 + 1992976.

It is an arithmetic number, because the mean of its divisors is an integer number (1992976).

Almost surely, 2^3985951 is an apocalyptic number.

3985951 is a deficient number, since it is larger than the sum of its proper divisors (1).

3985951 is an equidigital number, since it uses as much as digits as its factorization.

3985951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 40.

The square root of 3985951 is about 1996.4846605972. The cubic root of 3985951 is about 158.5540422151.

The spelling of 3985951 in words is "three million, nine hundred eighty-five thousand, nine hundred fifty-one".