3999901 has 2 divisors, whose sum is σ = 3999902. Its totient is φ = 3999900.

The previous prime is 3999893. The next prime is 3999917. The reversal of 3999901 is 1099993.

3999901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3059001 + 940900 = 1749^2 + 970^2 .

It is a cyclic number.

It is not a de Polignac number, because 3999901 - 2³ = 3999893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3999971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999950 + 1999951.

It is an arithmetic number, because the mean of its divisors is an integer number (1999951).

Almost surely, 2^3999901 is an apocalyptic number.

It is an amenable number.

3999901 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999901 is an equidigital number, since it uses as much as digits as its factorization.

3999901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19683, while the sum is 40.

The square root of 3999901 is about 1999.9752498469. The cubic root of 3999901 is about 158.7387955801.

It can be divided in two parts, 3999 and 901, that added together give a square (4900 = 70²).

The spelling of 3999901 in words is "three million, nine hundred ninety-nine thousand, nine hundred one".