405998501 has 2 divisors, whose sum is σ = 405998502. Its totient is φ = 405998500.

The previous prime is 405998477. The next prime is 405998531. The reversal of 405998501 is 105899504.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402002500 + 3996001 = 20050^2 + 1999^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405998501 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405998531) 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, 202999250 + 202999251.

It is an arithmetic number, because the mean of its divisors is an integer number (202999251).

Almost surely, 2^405998501 is an apocalyptic number.

It is an amenable number.

405998501 is a deficient number, since it is larger than the sum of its proper divisors (1).

405998501 is an equidigital number, since it uses as much as digits as its factorization.

405998501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 405998501 is about 20149.4044825151. The cubic root of 405998501 is about 740.4711517476.

The spelling of 405998501 in words is "four hundred five million, nine hundred ninety-eight thousand, five hundred one".