216140393 has 8 divisors (see below), whose sum is σ = 255535680. Its totient is φ = 178874640.

The previous prime is 216140389. The next prime is 216140399. The reversal of 216140393 is 393041612.

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

It is not a de Polignac number, because 216140393 - 2² = 216140389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216140399) 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, 532163 + ... + 532568.

It is an arithmetic number, because the mean of its divisors is an integer number (31941960).

Almost surely, 2^216140393 is an apocalyptic number.

It is an amenable number.

216140393 is a deficient number, since it is larger than the sum of its proper divisors (39395287).

216140393 is a wasteful number, since it uses less digits than its factorization.

216140393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064767.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 216140393 is about 14701.7139477001. The cubic root of 216140393 is about 600.1299653648.

The spelling of 216140393 in words is "two hundred sixteen million, one hundred forty thousand, three hundred ninety-three".