3943658 has 4 divisors (see below), whose sum is σ = 5915490. Its totient is φ = 1971828.

The previous prime is 3943651. The next prime is 3943661. The reversal of 3943658 is 8563493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8563493 = 43 ⋅199151.

It can be written as a sum of positive squares in only one way, i.e., 3659569 + 284089 = 1913^2 + 533^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3943651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985913 + ... + 985916.

Almost surely, 2^3943658 is an apocalyptic number.

3943658 is a deficient number, since it is larger than the sum of its proper divisors (1971832).

3943658 is a wasteful number, since it uses less digits than its factorization.

3943658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971831.

The product of its digits is 77760, while the sum is 38.

The square root of 3943658 is about 1985.8645472438. The cubic root of 3943658 is about 157.9912669424.

The spelling of 3943658 in words is "three million, nine hundred forty-three thousand, six hundred fifty-eight".