3639994 has 8 divisors (see below), whose sum is σ = 5470740. Its totient is φ = 1816416.

The previous prime is 3639991. The next prime is 3639997. The reversal of 3639994 is 4999363.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3639991) and next prime (3639997).

It can be written as a sum of positive squares in 2 ways, for example, as 2064969 + 1575025 = 1437^2 + 1255^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 3639994.

It is not an unprimeable number, because it can be changed into a prime (3639991) 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 3 ways as a sum of consecutive naturals, for example, 259 + ... + 2710.

Almost surely, 2^3639994 is an apocalyptic number.

3639994 is a deficient number, since it is larger than the sum of its proper divisors (1830746).

3639994 is a wasteful number, since it uses less digits than its factorization.

3639994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584.

The product of its digits is 157464, while the sum is 43.

The square root of 3639994 is about 1907.8768304060. The cubic root of 3639994 is about 153.8273490990.

The spelling of 3639994 in words is "three million, six hundred thirty-nine thousand, nine hundred ninety-four".