3918943 has 4 divisors (see below), whose sum is σ = 4478800. Its totient is φ = 3359088.

The previous prime is 3918923. The next prime is 3918949. The reversal of 3918943 is 3498193.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3918943 - 2²¹ = 1821791 is a prime.

It is a super-2 number, since 2×3918943² = 30716228474498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3918949) 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, 279918 + ... + 279931.

It is an arithmetic number, because the mean of its divisors is an integer number (1119700).

Almost surely, 2^3918943 is an apocalyptic number.

3918943 is a deficient number, since it is larger than the sum of its proper divisors (559857).

3918943 is an equidigital number, since it uses as much as digits as its factorization.

3918943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559856.

The product of its digits is 23328, while the sum is 37.

The square root of 3918943 is about 1979.6320365159. The cubic root of 3918943 is about 157.6605300356.

The spelling of 3918943 in words is "three million, nine hundred eighteen thousand, nine hundred forty-three".