216746242 has 8 divisors (see below), whose sum is σ = 326469132. Its totient is φ = 107923200.

The previous prime is 216746207. The next prime is 216746249. The reversal of 216746242 is 242647612.

It can be written as a sum of positive squares in 2 ways, for example, as 213715161 + 3031081 = 14619^2 + 1741^2 .

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

It is a super-2 number, since 2×216746242² = 93957866842245128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216746198 and 216746207.

It is not an unprimeable number, because it can be changed into a prime (216746249) 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, 224359 + ... + 225322.

Almost surely, 2^216746242 is an apocalyptic number.

216746242 is a deficient number, since it is larger than the sum of its proper divisors (109722890).

216746242 is a wasteful number, since it uses less digits than its factorization.

216746242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449924.

The product of its digits is 32256, while the sum is 34.

The square root of 216746242 is about 14722.3042354110. The cubic root of 216746242 is about 600.6901706179.

The spelling of 216746242 in words is "two hundred sixteen million, seven hundred forty-six thousand, two hundred forty-two".