281400 has 96 divisors (see below), whose sum is σ = 1011840. Its totient is φ = 63360.

The previous prime is 281381. The next prime is 281419. The reversal of 281400 is 4182.

It is an interprime number because it is at equal distance from previous prime (281381) and next prime (281419).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 281400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4167 + ... + 4233.

It is an arithmetic number, because the mean of its divisors is an integer number (10540).

2²⁸¹⁴⁰⁰ is an apocalyptic number.

281400 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 281400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (505920).

281400 is an abundant number, since it is smaller than the sum of its proper divisors (730440).

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

281400 is a wasteful number, since it uses less digits than its factorization.

281400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 281400 is about 530.4714883950. The cubic root of 281400 is about 65.5301805247.

Adding to 281400 its reverse (4182), we get a palindrome (285582).

The spelling of 281400 in words is "two hundred eighty-one thousand, four hundred".