3978907 has 4 divisors (see below), whose sum is σ = 3984120. Its totient is φ = 3973696.

The previous prime is 3978899. The next prime is 3978917. The reversal of 3978907 is 7098793.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3978907 - 2³ = 3978899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3978917) 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, 1213 + ... + 3070.

It is an arithmetic number, because the mean of its divisors is an integer number (996030).

Almost surely, 2^3978907 is an apocalyptic number.

3978907 is a deficient number, since it is larger than the sum of its proper divisors (5213).

3978907 is an equidigital number, since it uses as much as digits as its factorization.

3978907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5212.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 3978907 is about 1994.7197798187. The cubic root of 3978907 is about 158.4605878781.

The spelling of 3978907 in words is "three million, nine hundred seventy-eight thousand, nine hundred seven".