216997402 has 8 divisors (see below), whose sum is σ = 332421696. Its totient is φ = 106190172.

The previous prime is 216997399. The next prime is 216997411. The reversal of 216997402 is 204799612.

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

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, 1154148 + ... + 1154335.

It is an arithmetic number, because the mean of its divisors is an integer number (41552712).

Almost surely, 2^216997402 is an apocalyptic number.

216997402 is a deficient number, since it is larger than the sum of its proper divisors (115424294).

216997402 is a wasteful number, since it uses less digits than its factorization.

216997402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308532.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 216997402 is about 14730.8316805264. The cubic root of 216997402 is about 600.9221025226.

The spelling of 216997402 in words is "two hundred sixteen million, nine hundred ninety-seven thousand, four hundred two".