406623641 has 2 divisors, whose sum is σ = 406623642. Its totient is φ = 406623640.

The previous prime is 406623631. The next prime is 406623643. The reversal of 406623641 is 146326604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 385729600 + 20894041 = 19640^2 + 4571^2 .

It is a cyclic number.

It is not a de Polignac number, because 406623641 - 2⁶ = 406623577 is a prime.

Together with 406623643, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 406623598 and 406623607.

It is not a weakly prime, because it can be changed into another prime (406623643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203311820 + 203311821.

It is an arithmetic number, because the mean of its divisors is an integer number (203311821).

Almost surely, 2^406623641 is an apocalyptic number.

It is an amenable number.

406623641 is a deficient number, since it is larger than the sum of its proper divisors (1).

406623641 is an equidigital number, since it uses as much as digits as its factorization.

406623641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 406623641 is about 20164.9111329557. The cubic root of 406623641 is about 740.8510059866.

The spelling of 406623641 in words is "four hundred six million, six hundred twenty-three thousand, six hundred forty-one".