3940394 has 16 divisors (see below), whose sum is σ = 6065928. Its totient is φ = 1919232.

The previous prime is 3940381. The next prime is 3940397. The reversal of 3940394 is 4930493.

It can be written as a sum of positive squares in 4 ways, for example, as 3940225 + 169 = 1985^2 + 13^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3940394.

It is not an unprimeable number, because it can be changed into a prime (3940397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19904 + ... + 20100.

Almost surely, 2^3940394 is an apocalyptic number.

3940394 is a deficient number, since it is larger than the sum of its proper divisors (2125534).

3940394 is a wasteful number, since it uses less digits than its factorization.

3940394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 3940394 is about 1985.0425688131. The cubic root of 3940394 is about 157.9476673342.

Subtracting 3940394 from its reverse (4930493), we obtain a palindrome (990099).

It can be divided in two parts, 3940 and 394, that added together give a palindrome (4334).

The spelling of 3940394 in words is "three million, nine hundred forty thousand, three hundred ninety-four".