803218905 has 24 divisors (see below), whose sum is σ = 1426206600. Its totient is φ = 417934080.

The previous prime is 803218877. The next prime is 803218909. The reversal of 803218905 is 509812308.

It can be written as a sum of positive squares in 4 ways, for example, as 33489369 + 769729536 = 5787^2 + 27744^2 .

It is not a de Polignac number, because 803218905 - 2¹⁰ = 803217881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 803218905.

It is not an unprimeable number, because it can be changed into a prime (803218909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 215830 + ... + 219519.

It is an arithmetic number, because the mean of its divisors is an integer number (59425275).

Almost surely, 2^803218905 is an apocalyptic number.

It is an amenable number.

803218905 is a deficient number, since it is larger than the sum of its proper divisors (622987695).

803218905 is a wasteful number, since it uses less digits than its factorization.

803218905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435401 (or 435398 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 803218905 is about 28341.1168622551. The cubic root of 803218905 is about 929.5611700040.

The spelling of 803218905 in words is "eight hundred three million, two hundred eighteen thousand, nine hundred five".