405201905 has 4 divisors (see below), whose sum is σ = 486242292. Its totient is φ = 324161520.

The previous prime is 405201889. The next prime is 405201917. The reversal of 405201905 is 509102504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41460721 + 363741184 = 6439^2 + 19072^2 .

It is not a de Polignac number, because 405201905 - 2⁴ = 405201889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40520186 + ... + 40520195.

It is an arithmetic number, because the mean of its divisors is an integer number (121560573).

Almost surely, 2^405201905 is an apocalyptic number.

It is an amenable number.

405201905 is a deficient number, since it is larger than the sum of its proper divisors (81040387).

405201905 is an equidigital number, since it uses as much as digits as its factorization.

405201905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81040386.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 405201905 is about 20129.6275425056. The cubic root of 405201905 is about 739.9865501573.

The spelling of 405201905 in words is "four hundred five million, two hundred one thousand, nine hundred five".