213947685 has 48 divisors (see below), whose sum is σ = 425093760. Its totient is φ = 97511040.

The previous prime is 213947681. The next prime is 213947687. The reversal of 213947685 is 586749312.

It is not a de Polignac number, because 213947685 - 2² = 213947681 is a prime.

It is a super-2 number, since 2×213947685² = 91547223833718450, which contains 22 as substring.

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 213947685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213947681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 131175 + ... + 132795.

It is an arithmetic number, because the mean of its divisors is an integer number (8856120).

Almost surely, 2^213947685 is an apocalyptic number.

It is an amenable number.

213947685 is a deficient number, since it is larger than the sum of its proper divisors (211146075).

213947685 is a wasteful number, since it uses less digits than its factorization.

213947685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058 (or 2055 counting only the distinct ones).

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

The square root of 213947685 is about 14626.9506391455. The cubic root of 213947685 is about 598.0936578474.

The spelling of 213947685 in words is "two hundred thirteen million, nine hundred forty-seven thousand, six hundred eighty-five".