216472381 has 8 divisors (see below), whose sum is σ = 217652864. Its totient is φ = 215295840.

The previous prime is 216472379. The next prime is 216472427. The reversal of 216472381 is 183274612.

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

It is a cyclic number.

It is not a de Polignac number, because 216472381 - 2¹ = 216472379 is a prime.

It is a super-2 number, since 2×216472381² = 93720583471618322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216472351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209041 + ... + 210073.

It is an arithmetic number, because the mean of its divisors is an integer number (27206608).

Almost surely, 2^216472381 is an apocalyptic number.

It is an amenable number.

216472381 is a deficient number, since it is larger than the sum of its proper divisors (1180483).

216472381 is a wasteful number, since it uses less digits than its factorization.

216472381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1971.

The product of its digits is 16128, while the sum is 34.

The square root of 216472381 is about 14713.0004078026. Note that the first 3 decimals coincide. The cubic root of 216472381 is about 600.4370713519.

The spelling of 216472381 in words is "two hundred sixteen million, four hundred seventy-two thousand, three hundred eighty-one".