3994945 has 8 divisors (see below), whose sum is σ = 4843944. Its totient is φ = 3162624.

The previous prime is 3994937. The next prime is 3994961. The reversal of 3994945 is 5494993.

3994945 = 153² + 154² + ... + 249².

It can be written as a sum of positive squares in 4 ways, for example, as 505521 + 3489424 = 711^2 + 1868^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3994945 - 2³ = 3994937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3634 + ... + 4603.

It is an arithmetic number, because the mean of its divisors is an integer number (605493).

Almost surely, 2^3994945 is an apocalyptic number.

It is an amenable number.

3994945 is a deficient number, since it is larger than the sum of its proper divisors (848999).

3994945 is an equidigital number, since it uses as much as digits as its factorization.

3994945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8339.

The product of its digits is 174960, while the sum is 43.

The square root of 3994945 is about 1998.7358504815. The cubic root of 3994945 is about 158.6732077390.

The spelling of 3994945 in words is "three million, nine hundred ninety-four thousand, nine hundred forty-five".