213667993 has 8 divisors (see below), whose sum is σ = 266391360. Its totient is φ = 166494480.

The previous prime is 213667991. The next prime is 213667997. The reversal of 213667993 is 399766312.

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

It is a cyclic number.

It is not a de Polignac number, because 213667993 - 2¹ = 213667991 is a prime.

It is a super-2 number, since 2×213667993² = 91308022465296098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213667991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1387378 + ... + 1387531.

It is an arithmetic number, because the mean of its divisors is an integer number (33298920).

Almost surely, 2^213667993 is an apocalyptic number.

It is an amenable number.

213667993 is a deficient number, since it is larger than the sum of its proper divisors (52723367).

213667993 is a wasteful number, since it uses less digits than its factorization.

213667993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2774927.

The product of its digits is 367416, while the sum is 46.

The square root of 213667993 is about 14617.3866679376. The cubic root of 213667993 is about 597.8329165984.

The spelling of 213667993 in words is "two hundred thirteen million, six hundred sixty-seven thousand, nine hundred ninety-three".