216399274 has 16 divisors (see below), whose sum is σ = 399506688. Its totient is φ = 85608432.

The previous prime is 216399257. The next prime is 216399283. The reversal of 216399274 is 472993612.

It is a self number, because there is not a number n which added to its sum of digits gives 216399274.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594322 + ... + 594685.

It is an arithmetic number, because the mean of its divisors is an integer number (24969168).

Almost surely, 2^216399274 is an apocalyptic number.

216399274 is a deficient number, since it is larger than the sum of its proper divisors (183107414).

216399274 is a wasteful number, since it uses less digits than its factorization.

216399274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189029.

The product of its digits is 163296, while the sum is 43.

The square root of 216399274 is about 14710.5157625421. The cubic root of 216399274 is about 600.3694705873.

The spelling of 216399274 in words is "two hundred sixteen million, three hundred ninety-nine thousand, two hundred seventy-four".