805634390 has 32 divisors (see below), whose sum is σ = 1665239040. Its totient is φ = 277538400.

The previous prime is 805634387. The next prime is 805634443. The reversal of 805634390 is 93436508.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190646 + ... + 194825.

It is an arithmetic number, because the mean of its divisors is an integer number (52038720).

Almost surely, 2^805634390 is an apocalyptic number.

805634390 is an abundant number, since it is smaller than the sum of its proper divisors (859604650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

805634390 is a wasteful number, since it uses less digits than its factorization.

805634390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385508.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 805634390 is about 28383.6993712941. The cubic root of 805634390 is about 930.4920470163.

The spelling of 805634390 in words is "eight hundred five million, six hundred thirty-four thousand, three hundred ninety".