3978007 has 4 divisors (see below), whose sum is σ = 4339656. Its totient is φ = 3616360.

The previous prime is 3977999. The next prime is 3978031. The reversal of 3978007 is 7008793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7008793 = 11 ⋅637163.

It is not a de Polignac number, because 3978007 - 2³ = 3977999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180808 + ... + 180829.

It is an arithmetic number, because the mean of its divisors is an integer number (1084914).

Almost surely, 2^3978007 is an apocalyptic number.

3978007 is a deficient number, since it is larger than the sum of its proper divisors (361649).

3978007 is a wasteful number, since it uses less digits than its factorization.

3978007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361648.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 3978007 is about 1994.4941714630. The cubic root of 3978007 is about 158.4486394307.

The spelling of 3978007 in words is "three million, nine hundred seventy-eight thousand, seven".