216130394 has 12 divisors (see below), whose sum is σ = 333152574. Its totient is φ = 105082992.

The previous prime is 216130391. The next prime is 216130403. The reversal of 216130394 is 493031612.

It can be written as a sum of positive squares in 3 ways, for example, as 166074769 + 50055625 = 12887^2 + 7075^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (216130391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 125612 + ... + 127320.

Almost surely, 2^216130394 is an apocalyptic number.

216130394 is a deficient number, since it is larger than the sum of its proper divisors (117022180).

216130394 is an frugal number, since it uses more digits than its factorization.

216130394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3457 (or 1748 counting only the distinct ones).

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

The square root of 216130394 is about 14701.3738813758. The cubic root of 216130394 is about 600.1207108984.

The spelling of 216130394 in words is "two hundred sixteen million, one hundred thirty thousand, three hundred ninety-four".