409812478 has 4 divisors (see below), whose sum is σ = 614718720. Its totient is φ = 204906238.

The previous prime is 409812443. The next prime is 409812479. The reversal of 409812478 is 874218904.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409812479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102453118 + ... + 102453121.

It is an arithmetic number, because the mean of its divisors is an integer number (153679680).

Almost surely, 2^409812478 is an apocalyptic number.

409812478 is a deficient number, since it is larger than the sum of its proper divisors (204906242).

409812478 is a wasteful number, since it uses less digits than its factorization.

409812478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204906241.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 409812478 is about 20243.8256759932. The cubic root of 409812478 is about 742.7826072617.

The spelling of 409812478 in words is "four hundred nine million, eight hundred twelve thousand, four hundred seventy-eight".