216423400 has 96 divisors (see below), whose sum is σ = 528180480. Its totient is φ = 82368000.

The previous prime is 216423371. The next prime is 216423409. The reversal of 216423400 is 4324612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216423409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 415140 + ... + 415660.

It is an arithmetic number, because the mean of its divisors is an integer number (5501880).

Almost surely, 2^216423400 is an apocalyptic number.

216423400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216423400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264090240).

216423400 is an abundant number, since it is smaller than the sum of its proper divisors (311757080).

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

216423400 is a wasteful number, since it uses less digits than its factorization.

216423400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 216423400 is about 14711.3357653206. The cubic root of 216423400 is about 600.3917811606.

The spelling of 216423400 in words is "two hundred sixteen million, four hundred twenty-three thousand, four hundred".