3942578 has 4 divisors (see below), whose sum is σ = 5913870. Its totient is φ = 1971288.

The previous prime is 3942577. The next prime is 3942581. The reversal of 3942578 is 8752493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8752493 = 107 ⋅81799.

It can be written as a sum of positive squares in only one way, i.e., 3265249 + 677329 = 1807^2 + 823^2 .

It is not an unprimeable number, because it can be changed into a prime (3942571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985643 + ... + 985646.

Almost surely, 2^3942578 is an apocalyptic number.

3942578 is a deficient number, since it is larger than the sum of its proper divisors (1971292).

3942578 is a wasteful number, since it uses less digits than its factorization.

3942578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971291.

The product of its digits is 60480, while the sum is 38.

The square root of 3942578 is about 1985.5926067550. The cubic root of 3942578 is about 157.9768432655.

The spelling of 3942578 in words is "three million, nine hundred forty-two thousand, five hundred seventy-eight".