143666440 has 64 divisors (see below), whose sum is σ = 334445760. Its totient is φ = 55507200.

The previous prime is 143666437. The next prime is 143666447. The reversal of 143666440 is 44666341.

It is a junction number, because it is equal to n+sod(n) for n = 143666396 and 143666405.

It is not an unprimeable number, because it can be changed into a prime (143666447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173307 + ... + 174133.

It is an arithmetic number, because the mean of its divisors is an integer number (5225715).

Almost surely, 2^143666440 is an apocalyptic number.

143666440 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 143666440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167222880).

143666440 is an abundant number, since it is smaller than the sum of its proper divisors (190779320).

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

143666440 is a wasteful number, since it uses less digits than its factorization.

143666440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982 (or 978 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 143666440 is about 11986.0936088452. The cubic root of 143666440 is about 523.7432555337.

Subtracting from 143666440 its reverse (44666341), we obtain a palindrome (99000099).

It can be divided in two parts, 1436 and 66440, that added together give a palindrome (67876).

The spelling of 143666440 in words is "one hundred forty-three million, six hundred sixty-six thousand, four hundred forty".