213699966 has 8 divisors (see below), whose sum is σ = 427399944. Its totient is φ = 71233320.

The previous prime is 213699961. The next prime is 213699991. The reversal of 213699966 is 669996312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

213699966 is an admirable number.

It is a super-3 number, since 3×213699966³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213699961) 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, 17808325 + ... + 17808336.

It is an arithmetic number, because the mean of its divisors is an integer number (53424993).

Almost surely, 2^213699966 is an apocalyptic number.

213699966 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

213699966 is a wasteful number, since it uses less digits than its factorization.

213699966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35616666.

The product of its digits is 944784, while the sum is 51.

The square root of 213699966 is about 14618.4802903722. The cubic root of 213699966 is about 597.8627347573.

The spelling of 213699966 in words is "two hundred thirteen million, six hundred ninety-nine thousand, nine hundred sixty-six".