3945442 has 4 divisors (see below), whose sum is σ = 5918166. Its totient is φ = 1972720.

The previous prime is 3945427. The next prime is 3945449. The reversal of 3945442 is 2445493.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2445493 = 251 ⋅9743.

It can be written as a sum of positive squares in only one way, i.e., 2886601 + 1058841 = 1699^2 + 1029^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986359 + ... + 986362.

Almost surely, 2^3945442 is an apocalyptic number.

3945442 is a deficient number, since it is larger than the sum of its proper divisors (1972724).

3945442 is a wasteful number, since it uses less digits than its factorization.

3945442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972723.

The product of its digits is 17280, while the sum is 31.

The square root of 3945442 is about 1986.3136711003. The cubic root of 3945442 is about 158.0150869533.

The spelling of 3945442 in words is "three million, nine hundred forty-five thousand, four hundred forty-two".