3943738 has 4 divisors (see below), whose sum is σ = 5915610. Its totient is φ = 1971868.

The previous prime is 3943721. The next prime is 3943757. The reversal of 3943738 is 8373493.

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., 3932289 + 11449 = 1983^2 + 107^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3943697 and 3943706.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985933 + ... + 985936.

Almost surely, 2^3943738 is an apocalyptic number.

3943738 is the 1062-nd centered heptagonal number.

3943738 is a deficient number, since it is larger than the sum of its proper divisors (1971872).

3943738 is a wasteful number, since it uses less digits than its factorization.

3943738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971871.

The product of its digits is 54432, while the sum is 37.

The square root of 3943738 is about 1985.8846895024. The cubic root of 3943738 is about 157.9923352582.

The spelling of 3943738 in words is "three million, nine hundred forty-three thousand, seven hundred thirty-eight".