216403693 has 16 divisors (see below), whose sum is σ = 251817984. Its totient is φ = 183784960.

The previous prime is 216403633. The next prime is 216403697. The reversal of 216403693 is 396304612.

It is a happy number.

It is not a de Polignac number, because 216403693 - 2²¹ = 214306541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216403697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21396 + ... + 29842.

It is an arithmetic number, because the mean of its divisors is an integer number (15738624).

Almost surely, 2^216403693 is an apocalyptic number.

It is an amenable number.

216403693 is a deficient number, since it is larger than the sum of its proper divisors (35414291).

216403693 is a wasteful number, since it uses less digits than its factorization.

216403693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8612.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 216403693 is about 14710.6659604520. The cubic root of 216403693 is about 600.3735571916.

The spelling of 216403693 in words is "two hundred sixteen million, four hundred three thousand, six hundred ninety-three".