213685944 has 16 divisors (see below), whose sum is σ = 534214920. Its totient is φ = 71228640.

The previous prime is 213685943. The next prime is 213685957. The reversal of 213685944 is 449586312.

It is a super-2 number, since 2×213685944² = 91323365326342272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213685896 and 213685905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213685943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4451767 + ... + 4451814.

Almost surely, 2^213685944 is an apocalyptic number.

213685944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

213685944 is an abundant number, since it is smaller than the sum of its proper divisors (320528976).

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

213685944 is a wasteful number, since it uses less digits than its factorization.

213685944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8903590 (or 8903586 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The square root of 213685944 is about 14618.0006840881. Note that the first 3 decimals coincide. The cubic root of 213685944 is about 597.8496581453.

The spelling of 213685944 in words is "two hundred thirteen million, six hundred eighty-five thousand, nine hundred forty-four".