3940402 has 4 divisors (see below), whose sum is σ = 5910606. Its totient is φ = 1970200.

The previous prime is 3940397. The next prime is 3940411. The reversal of 3940402 is 2040493.

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., 2253001 + 1687401 = 1501^2 + 1299^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985099 + ... + 985102.

Almost surely, 2^3940402 is an apocalyptic number.

3940402 is a deficient number, since it is larger than the sum of its proper divisors (1970204).

3940402 is a wasteful number, since it uses less digits than its factorization.

3940402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970203.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 3940402 is about 1985.0445838822. The cubic root of 3940402 is about 157.9477742255.

Adding to 3940402 its reverse (2040493), we get a palindrome (5980895).

The spelling of 3940402 in words is "three million, nine hundred forty thousand, four hundred two".