216835406 has 4 divisors (see below), whose sum is σ = 325253112. Its totient is φ = 108417702.

The previous prime is 216835403. The next prime is 216835427. The reversal of 216835406 is 604538612.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216835403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54208850 + ... + 54208853.

It is an arithmetic number, because the mean of its divisors is an integer number (81313278).

Almost surely, 2^216835406 is an apocalyptic number.

216835406 is a deficient number, since it is larger than the sum of its proper divisors (108417706).

216835406 is a wasteful number, since it uses less digits than its factorization.

216835406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108417705.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 216835406 is about 14725.3321184957. The cubic root of 216835406 is about 600.7725289788.

The spelling of 216835406 in words is "two hundred sixteen million, eight hundred thirty-five thousand, four hundred six".