3975649 has 2 divisors, whose sum is σ = 3975650. Its totient is φ = 3975648.

The previous prime is 3975599. The next prime is 3975659. The reversal of 3975649 is 9465793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3972049 + 3600 = 1993^2 + 60^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3975649 is a prime.

3975649 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3975659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1987824 + 1987825.

It is an arithmetic number, because the mean of its divisors is an integer number (1987825).

Almost surely, 2^3975649 is an apocalyptic number.

It is an amenable number.

3975649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3975649 is an equidigital number, since it uses as much as digits as its factorization.

3975649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 43.

The square root of 3975649 is about 1993.9029565152. The cubic root of 3975649 is about 158.4173259497.

It can be divided in two parts, 3975 and 649, that added together give a square (4624 = 68²).

The spelling of 3975649 in words is "three million, nine hundred seventy-five thousand, six hundred forty-nine".