213794865 has 12 divisors (see below), whose sum is σ = 370577844. Its totient is φ = 114023904.

The previous prime is 213794863. The next prime is 213794899. The reversal of 213794865 is 568497312.

It can be written as a sum of positive squares in 2 ways, for example, as 57744801 + 156050064 = 7599^2 + 12492^2 .

It is not a de Polignac number, because 213794865 - 2¹ = 213794863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 4750997 = 213794865 / (2 + 1 + 3 + 7 + 9 + 4 + 8 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 213794865.

It is not an unprimeable number, because it can be changed into a prime (213794863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2375454 + ... + 2375543.

It is an arithmetic number, because the mean of its divisors is an integer number (30881487).

Almost surely, 2^213794865 is an apocalyptic number.

It is an amenable number.

213794865 is a deficient number, since it is larger than the sum of its proper divisors (156782979).

213794865 is a wasteful number, since it uses less digits than its factorization.

213794865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4751008 (or 4751005 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 213794865 is about 14621.7257873344. The cubic root of 213794865 is about 597.9512204668.

It can be divided in two parts, 21379 and 4865, that added together give a square (26244 = 162²).

The spelling of 213794865 in words is "two hundred thirteen million, seven hundred ninety-four thousand, eight hundred sixty-five".