216340408 has 16 divisors (see below), whose sum is σ = 411352560. Its totient is φ = 106646400.

The previous prime is 216340367. The next prime is 216340417. The reversal of 216340408 is 804043612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189873 + ... + 191008.

It is an arithmetic number, because the mean of its divisors is an integer number (25709535).

Almost surely, 2^216340408 is an apocalyptic number.

It is an amenable number.

216340408 is a deficient number, since it is larger than the sum of its proper divisors (195012152).

216340408 is a wasteful number, since it uses less digits than its factorization.

216340408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380958 (or 380954 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 216340408 is about 14708.5148128559. The cubic root of 216340408 is about 600.3150271601.

The spelling of 216340408 in words is "two hundred sixteen million, three hundred forty thousand, four hundred eight".