3978979493 has 2 divisors, whose sum is σ = 3978979494. Its totient is φ = 3978979492.

The previous prime is 3978979483. The next prime is 3978979513. The reversal of 3978979493 is 3949798793.

3978979493 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3934049284 + 44930209 = 62722^2 + 6703^2 .

It is a cyclic number.

It is not a de Polignac number, because 3978979493 - 2⁸ = 3978979237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3978979483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989489746 + 1989489747.

It is an arithmetic number, because the mean of its divisors is an integer number (1989489747).

Almost surely, 2^3978979493 is an apocalyptic number.

It is an amenable number.

3978979493 is a deficient number, since it is larger than the sum of its proper divisors (1).

3978979493 is an equidigital number, since it uses as much as digits as its factorization.

3978979493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92588832, while the sum is 68.

The square root of 3978979493 is about 63079.1526021078. The cubic root of 3978979493 is about 1584.6155022055.

The spelling of 3978979493 in words is "three billion, nine hundred seventy-eight million, nine hundred seventy-nine thousand, four hundred ninety-three".