3978479 has 2 divisors, whose sum is σ = 3978480. Its totient is φ = 3978478.

The previous prime is 3978473. The next prime is 3978497. The reversal of 3978479 is 9748793.

Together with next prime (3978497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3978479 - 2¹⁶ = 3912943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3978473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989239 + 1989240.

It is an arithmetic number, because the mean of its divisors is an integer number (1989240).

Almost surely, 2^3978479 is an apocalyptic number.

3978479 is a deficient number, since it is larger than the sum of its proper divisors (1).

3978479 is an equidigital number, since it uses as much as digits as its factorization.

3978479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 47.

The square root of 3978479 is about 1994.6124936940. The cubic root of 3978479 is about 158.4549059522.

The spelling of 3978479 in words is "three million, nine hundred seventy-eight thousand, four hundred seventy-nine".