3978427 has 4 divisors (see below), whose sum is σ = 4033000. Its totient is φ = 3923856.

The previous prime is 3978421. The next prime is 3978431. The reversal of 3978427 is 7248793.

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 3978427 - 2¹⁵ = 3945659 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3978427.

It is not an unprimeable number, because it can be changed into a prime (3978421) 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, 27177 + ... + 27322.

It is an arithmetic number, because the mean of its divisors is an integer number (1008250).

Almost surely, 2^3978427 is an apocalyptic number.

3978427 is a deficient number, since it is larger than the sum of its proper divisors (54573).

3978427 is an equidigital number, since it uses as much as digits as its factorization.

3978427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54572.

The product of its digits is 84672, while the sum is 40.

The square root of 3978427 is about 1994.5994585380. The cubic root of 3978427 is about 158.4542155970.

The spelling of 3978427 in words is "three million, nine hundred seventy-eight thousand, four hundred twenty-seven".