3639947 has 4 divisors (see below), whose sum is σ = 3668736. Its totient is φ = 3611160.

The previous prime is 3639941. The next prime is 3639959. The reversal of 3639947 is 7499363.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3639947 - 2¹⁰ = 3638923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3639941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14204 + ... + 14457.

It is an arithmetic number, because the mean of its divisors is an integer number (917184).

Almost surely, 2^3639947 is an apocalyptic number.

3639947 is a deficient number, since it is larger than the sum of its proper divisors (28789).

3639947 is a wasteful number, since it uses less digits than its factorization.

3639947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28788.

The product of its digits is 122472, while the sum is 41.

The square root of 3639947 is about 1907.8645130092. The cubic root of 3639947 is about 153.8266870176.

The spelling of 3639947 in words is "three million, six hundred thirty-nine thousand, nine hundred forty-seven".