404975447 has 2 divisors, whose sum is σ = 404975448. Its totient is φ = 404975446.

The previous prime is 404975429. The next prime is 404975449. The reversal of 404975447 is 744579404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 404975447 - 2⁶ = 404975383 is a prime.

It is a super-2 number, since 2×404975447² = 328010225345699618, which contains 22 as substring.

Together with 404975449, 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 = 404975398 and 404975407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404975449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202487723 + 202487724.

It is an arithmetic number, because the mean of its divisors is an integer number (202487724).

Almost surely, 2^404975447 is an apocalyptic number.

404975447 is a deficient number, since it is larger than the sum of its proper divisors (1).

404975447 is an equidigital number, since it uses as much as digits as its factorization.

404975447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 44.

The square root of 404975447 is about 20124.0017640627. The cubic root of 404975447 is about 739.8486706624.

The spelling of 404975447 in words is "four hundred four million, nine hundred seventy-five thousand, four hundred forty-seven".