809138445 has 8 divisors (see below), whose sum is σ = 1294621536. Its totient is φ = 431540496.

The previous prime is 809138381. The next prime is 809138513. The reversal of 809138445 is 544831908.

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

It is not a de Polignac number, because 809138445 - 2⁶ = 809138381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 809138397 and 809138406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26971267 + ... + 26971296.

It is an arithmetic number, because the mean of its divisors is an integer number (161827692).

Almost surely, 2^809138445 is an apocalyptic number.

It is an amenable number.

809138445 is a deficient number, since it is larger than the sum of its proper divisors (485483091).

809138445 is a wasteful number, since it uses less digits than its factorization.

809138445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53942571.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 809138445 is about 28445.3589360374. The cubic root of 809138445 is about 931.8391343281.

The spelling of 809138445 in words is "eight hundred nine million, one hundred thirty-eight thousand, four hundred forty-five".