213640366 has 16 divisors (see below), whose sum is σ = 324999360. Its totient is φ = 105315840.

The previous prime is 213640337. The next prime is 213640367. The reversal of 213640366 is 663046312.

It is a super-2 number, since 2×213640366² = 91284411969227912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213640367) 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 7 ways as a sum of consecutive naturals, for example, 52555 + ... + 56473.

It is an arithmetic number, because the mean of its divisors is an integer number (20312460).

Almost surely, 2^213640366 is an apocalyptic number.

213640366 is a deficient number, since it is larger than the sum of its proper divisors (111358994).

213640366 is a wasteful number, since it uses less digits than its factorization.

213640366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4299.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 213640366 is about 14616.4416326273. The cubic root of 213640366 is about 597.8071491424.

Adding to 213640366 its reverse (663046312), we get a palindrome (876686678).

The spelling of 213640366 in words is "two hundred thirteen million, six hundred forty thousand, three hundred sixty-six".