3994289 has 4 divisors (see below), whose sum is σ = 4301556. Its totient is φ = 3687024.

The previous prime is 3994279. The next prime is 3994357. The reversal of 3994289 is 9824993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9824993 = 79 ⋅124367.

It can be written as a sum of positive squares in 2 ways, for example, as 2505889 + 1488400 = 1583^2 + 1220^2 .

It is a cyclic number.

It is not a de Polignac number, because 3994289 - 2¹⁶ = 3928753 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3994229) 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, 153614 + ... + 153639.

It is an arithmetic number, because the mean of its divisors is an integer number (1075389).

Almost surely, 2^3994289 is an apocalyptic number.

It is an amenable number.

3994289 is a deficient number, since it is larger than the sum of its proper divisors (307267).

3994289 is a wasteful number, since it uses less digits than its factorization.

3994289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307266.

The product of its digits is 139968, while the sum is 44.

The square root of 3994289 is about 1998.5717400184. The cubic root of 3994289 is about 158.6645221524.

The spelling of 3994289 in words is "three million, nine hundred ninety-four thousand, two hundred eighty-nine".