216173407 has 4 divisors (see below), whose sum is σ = 218086560. Its totient is φ = 214260256.

The previous prime is 216173401. The next prime is 216173429. The reversal of 216173407 is 704371612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216173407 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216173401) 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, 956407 + ... + 956632.

It is an arithmetic number, because the mean of its divisors is an integer number (54521640).

Almost surely, 2^216173407 is an apocalyptic number.

216173407 is a deficient number, since it is larger than the sum of its proper divisors (1913153).

216173407 is a wasteful number, since it uses less digits than its factorization.

216173407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913152.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 216173407 is about 14702.8366990863. The cubic root of 216173407 is about 600.1605190892.

The spelling of 216173407 in words is "two hundred sixteen million, one hundred seventy-three thousand, four hundred seven".