216405274 has 32 divisors (see below), whose sum is σ = 351786240. Its totient is φ = 99466752.

The previous prime is 216405263. The next prime is 216405281. The reversal of 216405274 is 472504612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 467167 + ... + 467629.

It is an arithmetic number, because the mean of its divisors is an integer number (10993320).

Almost surely, 2^216405274 is an apocalyptic number.

216405274 is a deficient number, since it is larger than the sum of its proper divisors (135380966).

216405274 is a wasteful number, since it uses less digits than its factorization.

216405274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 216405274 is about 14710.7196968741. The cubic root of 216405274 is about 600.3750192558.

Adding to 216405274 its reverse (472504612), we get a palindrome (688909886).

The spelling of 216405274 in words is "two hundred sixteen million, four hundred five thousand, two hundred seventy-four".