216940623 has 8 divisors (see below), whose sum is σ = 301830528. Its totient is φ = 138338904.

The previous prime is 216940609. The next prime is 216940663. The reversal of 216940623 is 326049612.

216940623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 216940623 - 2¹⁰ = 216939599 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216940663) 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, 1571965 + ... + 1572102.

It is an arithmetic number, because the mean of its divisors is an integer number (37728816).

Almost surely, 2^216940623 is an apocalyptic number.

216940623 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

216940623 is a deficient number, since it is larger than the sum of its proper divisors (84889905).

216940623 is a wasteful number, since it uses less digits than its factorization.

216940623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144093.

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

The square root of 216940623 is about 14728.9043380694. The cubic root of 216940623 is about 600.8696860235.

The spelling of 216940623 in words is "two hundred sixteen million, nine hundred forty thousand, six hundred twenty-three".