3942817 has 4 divisors (see below), whose sum is σ = 3947076. Its totient is φ = 3938560.

The previous prime is 3942781. The next prime is 3942839. The reversal of 3942817 is 7182493.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7182493 = 47 ⋅152819.

It can be written as a sum of positive squares in 2 ways, for example, as 553536 + 3389281 = 744^2 + 1841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3942817 is a prime.

It is a Duffinian number.

3942817 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3942217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88 + ... + 2809.

It is an arithmetic number, because the mean of its divisors is an integer number (986769).

Almost surely, 2^3942817 is an apocalyptic number.

It is an amenable number.

3942817 is a deficient number, since it is larger than the sum of its proper divisors (4259).

3942817 is a wasteful number, since it uses less digits than its factorization.

3942817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4258.

The product of its digits is 12096, while the sum is 34.

The square root of 3942817 is about 1985.6527893869. The cubic root of 3942817 is about 157.9800353987.

The spelling of 3942817 in words is "three million, nine hundred forty-two thousand, eight hundred seventeen".