3955649 has 2 divisors, whose sum is σ = 3955650. Its totient is φ = 3955648.

The previous prime is 3955643. The next prime is 3955657. The reversal of 3955649 is 9465593.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2745649 + 1210000 = 1657^2 + 1100^2 .

It is an emirp because it is prime and its reverse (9465593) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3955649 - 2¹² = 3951553 is a prime.

It is a super-2 number, since 2×3955649² = 31294318022402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3955643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1977824 + 1977825.

It is an arithmetic number, because the mean of its divisors is an integer number (1977825).

Almost surely, 2^3955649 is an apocalyptic number.

It is an amenable number.

3955649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3955649 is an equidigital number, since it uses as much as digits as its factorization.

3955649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145800, while the sum is 41.

The square root of 3955649 is about 1988.8813438715. The cubic root of 3955649 is about 158.1512331819.

The spelling of 3955649 in words is "three million, nine hundred fifty-five thousand, six hundred forty-nine".