213634786 has 12 divisors (see below), whose sum is σ = 323157222. Its totient is φ = 105917616.

The previous prime is 213634777. The next prime is 213634789. The reversal of 213634786 is 687436312.

It can be written as a sum of positive squares in only one way, i.e., 175430025 + 38204761 = 13245^2 + 6181^2 .

It is a pancake number, because a pancake can be divided into 213634786 parts by 20670 straight cuts.

It is not an unprimeable number, because it can be changed into a prime (213634789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 241501 + ... + 242383.

Almost surely, 2^213634786 is an apocalyptic number.

213634786 is a deficient number, since it is larger than the sum of its proper divisors (109522436).

213634786 is an frugal number, since it uses more digits than its factorization.

213634786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1905 (or 1022 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 213634786 is about 14616.2507504490. The cubic root of 213634786 is about 597.8019444566.

The spelling of 213634786 in words is "two hundred thirteen million, six hundred thirty-four thousand, seven hundred eighty-six".