3649994 has 4 divisors (see below), whose sum is σ = 5474994. Its totient is φ = 1824996.

The previous prime is 3649993. The next prime is 3649999. The reversal of 3649994 is 4999463.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 2679769 + 970225 = 1637^2 + 985^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3649993) 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 as a sum of consecutive naturals, namely, 912497 + ... + 912500.

Almost surely, 2^3649994 is an apocalyptic number.

3649994 is a deficient number, since it is larger than the sum of its proper divisors (1825000).

3649994 is a wasteful number, since it uses less digits than its factorization.

3649994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824999.

The product of its digits is 209952, while the sum is 44.

The square root of 3649994 is about 1910.4957471819. The cubic root of 3649994 is about 153.9680880635.

The spelling of 3649994 in words is "three million, six hundred forty-nine thousand, nine hundred ninety-four".