143531406 has 64 divisors (see below), whose sum is σ = 329313600. Its totient is φ = 46310400.

The previous prime is 143531393. The next prime is 143531407. The reversal of 143531406 is 604135341.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 143531406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143531407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 533440 + ... + 533708.

It is an arithmetic number, because the mean of its divisors is an integer number (5145525).

Almost surely, 2^143531406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 143531406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164656800).

143531406 is an abundant number, since it is smaller than the sum of its proper divisors (185782194).

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

143531406 is a wasteful number, since it uses less digits than its factorization.

143531406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 143531406 is about 11980.4593401088. The cubic root of 143531406 is about 523.5791130097.

Adding to 143531406 its reverse (604135341), we get a palindrome (747666747).

The spelling of 143531406 in words is "one hundred forty-three million, five hundred thirty-one thousand, four hundred six".