213497865 has 96 divisors (see below), whose sum is σ = 441971712. Its totient is φ = 93312000.

The previous prime is 213497861. The next prime is 213497897. The reversal of 213497865 is 568794312.

It is not a de Polignac number, because 213497865 - 2² = 213497861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 213497865.

It is not an unprimeable number, because it can be changed into a prime (213497861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 787680 + ... + 787950.

It is an arithmetic number, because the mean of its divisors is an integer number (4603872).

Almost surely, 2^213497865 is an apocalyptic number.

It is an amenable number.

213497865 is an abundant number, since it is smaller than the sum of its proper divisors (228473847).

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

213497865 is a wasteful number, since it uses less digits than its factorization.

213497865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 388 counting only the distinct ones).

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

The square root of 213497865 is about 14611.5661378238. The cubic root of 213497865 is about 597.6742044408.

It can be divided in two parts, 2134 and 97865, that added together give a palindrome (99999).

The spelling of 213497865 in words is "two hundred thirteen million, four hundred ninety-seven thousand, eight hundred sixty-five".