3949651 has 2 divisors, whose sum is σ = 3949652. Its totient is φ = 3949650.

The previous prime is 3949643. The next prime is 3949657. The reversal of 3949651 is 1569493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3949651 - 2³ = 3949643 is a prime.

3949651 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3949651.

It is not a weakly prime, because it can be changed into another prime (3949657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1974825 + 1974826.

It is an arithmetic number, because the mean of its divisors is an integer number (1974826).

Almost surely, 2^3949651 is an apocalyptic number.

3949651 is a deficient number, since it is larger than the sum of its proper divisors (1).

3949651 is an equidigital number, since it uses as much as digits as its factorization.

3949651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 37.

The square root of 3949651 is about 1987.3728890171. The cubic root of 3949651 is about 158.0712571818.

The spelling of 3949651 in words is "three million, nine hundred forty-nine thousand, six hundred fifty-one".