43400 has 48 divisors (see below), whose sum is σ = 119040. Its totient is φ = 14400.

The previous prime is 43399. The next prime is 43403. The reversal of 43400 is 434.

43400 is nontrivially palindromic in base 3.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1385 + ... + 1415.

It is an arithmetic number, because the mean of its divisors is an integer number (2480).

2⁴³⁴⁰⁰ is an apocalyptic number.

43400 is a gapful number since it is divisible by the number (40) 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 43400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59520).

43400 is an abundant number, since it is smaller than the sum of its proper divisors (75640).

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

43400 is a wasteful number, since it uses less digits than its factorization.

43400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54 (or 45 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 11.

The square root of 43400 is about 208.3266665600. The cubic root of 43400 is about 35.1422779870.

Adding to 43400 its reverse (434), we get a palindrome (43834).

Multiplying 43400 by its reverse (434), we get a square (18835600 = 4340²).

43400 divided by its reverse (434) gives a square (100 = 10²).

The spelling of 43400 in words is "forty-three thousand, four hundred", and thus it is an iban number.