143640 has 128 divisors (see below), whose sum is σ = 576000. Its totient is φ = 31104.

The previous prime is 143629. The next prime is 143651. The reversal of 143640 is 46341.

It is a Cunningham number, because it is equal to 379²-1.

It is an interprime number because it is at equal distance from previous prime (143629) and next prime (143651).

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 143640.

It is an unprimeable number.

143640 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 31 ways as a sum of consecutive naturals, for example, 7551 + ... + 7569.

It is an arithmetic number, because the mean of its divisors is an integer number (4500).

2¹⁴³⁶⁴⁰ is an apocalyptic number.

143640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

143640 is the 240-th heptagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 143640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288000).

143640 is an abundant number, since it is smaller than the sum of its proper divisors (432360).

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

143640 is a wasteful number, since it uses less digits than its factorization.

143640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 143640 is about 378.9986807365. The cubic root of 143640 is about 52.3711124111.

Adding to 143640 its reverse (46341), we get a palindrome (189981).

The spelling of 143640 in words is "one hundred forty-three thousand, six hundred forty".