3978129907 has 4 divisors (see below), whose sum is σ = 4070644600. Its totient is φ = 3885615216.

The previous prime is 3978129871. The next prime is 3978129923. The reversal of 3978129907 is 7099218793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7099218793 = 683 ⋅10394171.

It is a cyclic number.

It is not a de Polignac number, because 3978129907 - 2²⁷ = 3843912179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3978129977) 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, 46257282 + ... + 46257367.

It is an arithmetic number, because the mean of its divisors is an integer number (1017661150).

Almost surely, 2^3978129907 is an apocalyptic number.

3978129907 is a deficient number, since it is larger than the sum of its proper divisors (92514693).

3978129907 is an equidigital number, since it uses as much as digits as its factorization.

3978129907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92514692.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The square root of 3978129907 is about 63072.4179574559. The cubic root of 3978129907 is about 1584.5027125670.

The spelling of 3978129907 in words is "three billion, nine hundred seventy-eight million, one hundred twenty-nine thousand, nine hundred seven".