405440747 has 2 divisors, whose sum is σ = 405440748. Its totient is φ = 405440746.

The previous prime is 405440731. The next prime is 405440767. The reversal of 405440747 is 747044504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405440747 - 2⁴ = 405440731 is a prime.

It is not a weakly prime, because it can be changed into another prime (405440767) 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, 202720373 + 202720374.

It is an arithmetic number, because the mean of its divisors is an integer number (202720374).

Almost surely, 2^405440747 is an apocalyptic number.

405440747 is a deficient number, since it is larger than the sum of its proper divisors (1).

405440747 is an equidigital number, since it uses as much as digits as its factorization.

405440747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62720, while the sum is 35.

The square root of 405440747 is about 20135.5592671274. The cubic root of 405440747 is about 740.1319140290.

The spelling of 405440747 in words is "four hundred five million, four hundred forty thousand, seven hundred forty-seven".