216431000 has 32 divisors (see below), whose sum is σ = 506450880. Its totient is φ = 86572000.

The previous prime is 216430999. The next prime is 216431003. The reversal of 216431000 is 134612.

It is a super-2 number, since 2×216431000² = 93684755522000000, which contains 22 as substring.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 216431000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216431003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107216 + ... + 109215.

It is an arithmetic number, because the mean of its divisors is an integer number (15826590).

Almost surely, 2^216431000 is an apocalyptic number.

216431000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216431000 is an abundant number, since it is smaller than the sum of its proper divisors (290019880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216431000 is a wasteful number, since it uses less digits than its factorization.

216431000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216452 (or 216438 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 216431000 is about 14711.5940672655. The cubic root of 216431000 is about 600.3988089344.

Adding to 216431000 its reverse (134612), we get a palindrome (216565612).

The spelling of 216431000 in words is "two hundred sixteen million, four hundred thirty-one thousand".