3996857 has 2 divisors, whose sum is σ = 3996858. Its totient is φ = 3996856.

The previous prime is 3996827. The next prime is 3996869. The reversal of 3996857 is 7586993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3519376 + 477481 = 1876^2 + 691^2 .

It is an emirp because it is prime and its reverse (7586993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3996857 - 2⁶ = 3996793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3996827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1998428 + 1998429.

It is an arithmetic number, because the mean of its divisors is an integer number (1998429).

Almost surely, 2^3996857 is an apocalyptic number.

It is an amenable number.

3996857 is a deficient number, since it is larger than the sum of its proper divisors (1).

3996857 is an equidigital number, since it uses as much as digits as its factorization.

3996857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 47.

The square root of 3996857 is about 1999.2140955886. The cubic root of 3996857 is about 158.6985176232.

It can be divided in two parts, 399685 and 7, that multiplied together give a triangular number (2797795 = T₂₃₆₅).

The spelling of 3996857 in words is "three million, nine hundred ninety-six thousand, eight hundred fifty-seven".