3972643 has 2 divisors, whose sum is σ = 3972644. Its totient is φ = 3972642.

The previous prime is 3972601. The next prime is 3972649. The reversal of 3972643 is 3462793.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3972643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3972599 and 3972608.

It is not a weakly prime, because it can be changed into another prime (3972649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1986321 + 1986322.

It is an arithmetic number, because the mean of its divisors is an integer number (1986322).

Almost surely, 2^3972643 is an apocalyptic number.

3972643 is a deficient number, since it is larger than the sum of its proper divisors (1).

3972643 is an equidigital number, since it uses as much as digits as its factorization.

3972643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 34.

The square root of 3972643 is about 1993.1490160046. The cubic root of 3972643 is about 158.3773892793.

The spelling of 3972643 in words is "three million, nine hundred seventy-two thousand, six hundred forty-three".