3972427 has 2 divisors, whose sum is σ = 3972428. Its totient is φ = 3972426.

The previous prime is 3972413. The next prime is 3972439. The reversal of 3972427 is 7242793.

It is a strong prime.

It is an emirp because it is prime and its reverse (7242793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3972427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3972392 and 3972401.

It is not a weakly prime, because it can be changed into another prime (3972467) 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 as a sum of consecutive naturals, namely, 1986213 + 1986214.

It is an arithmetic number, because the mean of its divisors is an integer number (1986214).

Almost surely, 2^3972427 is an apocalyptic number.

3972427 is a deficient number, since it is larger than the sum of its proper divisors (1).

3972427 is an equidigital number, since it uses as much as digits as its factorization.

3972427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 34.

The square root of 3972427 is about 1993.0948296556. The cubic root of 3972427 is about 158.3745188027.

The spelling of 3972427 in words is "three million, nine hundred seventy-two thousand, four hundred twenty-seven".