3978195407 has 2 divisors, whose sum is σ = 3978195408. Its totient is φ = 3978195406.

The previous prime is 3978195401. The next prime is 3978195427. The reversal of 3978195407 is 7045918793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3978195407 - 2¹⁶ = 3978129871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3978195401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989097703 + 1989097704.

It is an arithmetic number, because the mean of its divisors is an integer number (1989097704).

Almost surely, 2^3978195407 is an apocalyptic number.

3978195407 is a deficient number, since it is larger than the sum of its proper divisors (1).

3978195407 is an equidigital number, since it uses as much as digits as its factorization.

3978195407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The square root of 3978195407 is about 63072.9371997214. The cubic root of 3978195407 is about 1584.5114088105.

The spelling of 3978195407 in words is "three billion, nine hundred seventy-eight million, one hundred ninety-five thousand, four hundred seven".