215400 has 48 divisors (see below), whose sum is σ = 669600. Its totient is φ = 57280.

The previous prime is 215399. The next prime is 215417. The reversal of 215400 is 4512.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 421 + ... + 779.

It is an arithmetic number, because the mean of its divisors is an integer number (13950).

2²¹⁵⁴⁰⁰ is an apocalyptic number.

215400 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 215400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334800).

215400 is an abundant number, since it is smaller than the sum of its proper divisors (454200).

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

215400 is a wasteful number, since it uses less digits than its factorization.

215400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 369 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 215400 is about 464.1120554349. The cubic root of 215400 is about 59.9443929246.

Adding to 215400 its reverse (4512), we get a palindrome (219912).

The spelling of 215400 in words is "two hundred fifteen thousand, four hundred".