671400 has 72 divisors (see below), whose sum is σ = 2260830. Its totient is φ = 178560.

The previous prime is 671383. The next prime is 671401. The reversal of 671400 is 4176.

671400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 509796 + 161604 = 714^2 + 402^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (671401) by changing a digit.

671400 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1614 + ... + 1986.

2⁶⁷¹⁴⁰⁰ is an apocalyptic number.

671400 is a gapful number since it is divisible by the number (60) 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 671400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1130415).

671400 is an abundant number, since it is smaller than the sum of its proper divisors (1589430).

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

671400 is a wasteful number, since it uses less digits than its factorization.

671400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 671400 is about 819.3900170249. The cubic root of 671400 is about 87.5643064691.

Adding to 671400 its reverse (4176), we get a palindrome (675576).

The spelling of 671400 in words is "six hundred seventy-one thousand, four hundred".