3978743 has 2 divisors, whose sum is σ = 3978744. Its totient is φ = 3978742.

The previous prime is 3978739. The next prime is 3978749. The reversal of 3978743 is 3478793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3978743 - 2² = 3978739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3978743.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3978749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989371 + 1989372.

It is an arithmetic number, because the mean of its divisors is an integer number (1989372).

Almost surely, 2^3978743 is an apocalyptic number.

3978743 is a deficient number, since it is larger than the sum of its proper divisors (1).

3978743 is an equidigital number, since it uses as much as digits as its factorization.

3978743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 41.

The square root of 3978743 is about 1994.6786708641. The cubic root of 3978743 is about 158.4584107397.

The spelling of 3978743 in words is "three million, nine hundred seventy-eight thousand, seven hundred forty-three".