161400 has 48 divisors (see below), whose sum is σ = 502200. Its totient is φ = 42880.

The previous prime is 161387. The next prime is 161407. The reversal of 161400 is 4161.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161407) 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, 466 + ... + 734.

2¹⁶¹⁴⁰⁰ is an apocalyptic number.

161400 is a gapful number since it is divisible by the number (10) 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 161400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251100).

161400 is an abundant number, since it is smaller than the sum of its proper divisors (340800).

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

161400 is a wasteful number, since it uses less digits than its factorization.

161400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 161400 is about 401.7461885320. The cubic root of 161400 is about 54.4462337635.

Adding to 161400 its reverse (4161), we get a palindrome (165561).

It can be divided in two parts, 161 and 400, that added together give a triangular number (561 = T₃₃).

The spelling of 161400 in words is "one hundred sixty-one thousand, four hundred".