3643949 has 8 divisors (see below), whose sum is σ = 3777312. Its totient is φ = 3512880.

The previous prime is 3643921. The next prime is 3643951. The reversal of 3643949 is 9493463.

3643949 = T₃₉₀ + T₃₉₁ + ... + T₄₃₂.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3643949 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3059 + ... + 4079.

It is an arithmetic number, because the mean of its divisors is an integer number (472164).

Almost surely, 2^3643949 is an apocalyptic number.

It is an amenable number.

3643949 is a deficient number, since it is larger than the sum of its proper divisors (133363).

3643949 is a wasteful number, since it uses less digits than its factorization.

3643949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147.

The product of its digits is 69984, while the sum is 38.

The square root of 3643949 is about 1908.9130414977. The cubic root of 3643949 is about 153.8830421352.

The spelling of 3643949 in words is "three million, six hundred forty-three thousand, nine hundred forty-nine".