3995649 has 40 divisors (see below), whose sum is σ = 7085760. Its totient is φ = 2204496.

The previous prime is 3995647. The next prime is 3995653. The reversal of 3995649 is 9465993.

It is a happy number.

It is not a de Polignac number, because 3995649 - 2¹ = 3995647 is a prime.

It is a super-3 number, since 3×3995649³ (a number of 21 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3995647) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 137767 + ... + 137795.

It is an arithmetic number, because the mean of its divisors is an integer number (177144).

It is a Proth number, since it is equal to 1951 ⋅ 2¹¹ + 1 and 1951 < 2¹¹.

Almost surely, 2^3995649 is an apocalyptic number.

It is an amenable number.

3995649 is a deficient number, since it is larger than the sum of its proper divisors (3090111).

3995649 is an frugal number, since it uses more digits than its factorization.

3995649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63 (or 39 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 3995649 is about 1998.9119540390. The cubic root of 3995649 is about 158.6825277987.

The spelling of 3995649 in words is "three million, nine hundred ninety-five thousand, six hundred forty-nine".