405851945 has 8 divisors (see below), whose sum is σ = 489838536. Its totient is φ = 322804096.

The previous prime is 405851893. The next prime is 405851947. The reversal of 405851945 is 549158504.

It can be written as a sum of positive squares in 4 ways, for example, as 240498064 + 165353881 = 15508^2 + 12859^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 405851945 - 2⁶ = 405851881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405851947) 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 in 7 ways as a sum of consecutive naturals, for example, 233732 + ... + 235461.

It is an arithmetic number, because the mean of its divisors is an integer number (61229817).

Almost surely, 2^405851945 is an apocalyptic number.

It is an amenable number.

405851945 is a deficient number, since it is larger than the sum of its proper divisors (83986591).

405851945 is a wasteful number, since it uses less digits than its factorization.

405851945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469371.

The product of its (nonzero) digits is 144000, while the sum is 41.

The square root of 405851945 is about 20145.7674214709. The cubic root of 405851945 is about 740.3820434133.

The spelling of 405851945 in words is "four hundred five million, eight hundred fifty-one thousand, nine hundred forty-five".