213631386 has 16 divisors (see below), whose sum is σ = 429885984. Its totient is φ = 70773264.

The previous prime is 213631351. The next prime is 213631387. The reversal of 213631386 is 683136312.

It is not an unprimeable number, because it can be changed into a prime (213631387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108241 + ... + 110196.

It is an arithmetic number, because the mean of its divisors is an integer number (26867874).

Almost surely, 2^213631386 is an apocalyptic number.

213631386 is an abundant number, since it is smaller than the sum of its proper divisors (216254598).

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

213631386 is a wasteful number, since it uses less digits than its factorization.

213631386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218605.

The product of its digits is 15552, while the sum is 33.

The square root of 213631386 is about 14616.1344410894. The cubic root of 213631386 is about 597.7987730982.

Adding to 213631386 its reverse (683136312), we get a palindrome (896767698).

The spelling of 213631386 in words is "two hundred thirteen million, six hundred thirty-one thousand, three hundred eighty-six".