216453406 has 8 divisors (see below), whose sum is σ = 349655544. Its totient is φ = 99901560.

The previous prime is 216453379. The next prime is 216453409. The reversal of 216453406 is 604354612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216453409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4162540 + ... + 4162591.

It is an arithmetic number, because the mean of its divisors is an integer number (43706943).

Almost surely, 2^216453406 is an apocalyptic number.

216453406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

216453406 is a deficient number, since it is larger than the sum of its proper divisors (133202138).

216453406 is a wasteful number, since it uses less digits than its factorization.

216453406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8325146.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 216453406 is about 14712.3555557905. The cubic root of 216453406 is about 600.4195269639.

The spelling of 216453406 in words is "two hundred sixteen million, four hundred fifty-three thousand, four hundred six".