405726749 has 2 divisors, whose sum is σ = 405726750. Its totient is φ = 405726748.

The previous prime is 405726679. The next prime is 405726751. The reversal of 405726749 is 947627504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 339222724 + 66504025 = 18418^2 + 8155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405726749 is a prime.

It is a super-2 number, since 2×405726749² = 329228389708218002, which contains 22 as substring.

Together with 405726751, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405726149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202863374 + 202863375.

It is an arithmetic number, because the mean of its divisors is an integer number (202863375).

Almost surely, 2^405726749 is an apocalyptic number.

It is an amenable number.

405726749 is a deficient number, since it is larger than the sum of its proper divisors (1).

405726749 is an equidigital number, since it uses as much as digits as its factorization.

405726749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 44.

The square root of 405726749 is about 20142.6599286192. The cubic root of 405726749 is about 740.3059053008.

The spelling of 405726749 in words is "four hundred five million, seven hundred twenty-six thousand, seven hundred forty-nine".