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143381 = 720483

143381 has 4 divisors (see below), whose sum is σ = 163872. Its totient is φ = 122892.

The previous prime is 143357. The next prime is 143387. The reversal of 143381 is 183341.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183341 = 1391319.

It is not a de Polignac number, because 143381 - 210 = 142357 is a prime.

It is a super-2 number, since 2×1433812 = 41116222322, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 143381 parts by 535 straight cuts.

It is a Duffinian number.

It is a Curzon number.

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 143381.

It is not an unprimeable number, because it can be changed into a prime (143387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10235 + ... + 10248.

It is an arithmetic number, because the mean of its divisors is an integer number (40968).

2143381 is an apocalyptic number.

It is an amenable number.

143381 is a deficient number, since it is larger than the sum of its proper divisors (20491).

143381 is an equidigital number, since it uses as much as digits as its factorization.

143381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20490.

The product of its digits is 288, while the sum is 20.

The square root of 143381 is about 378.6568367269. The cubic root of 143381 is about 52.3396163588.

The spelling of 143381 in words is "one hundred forty-three thousand, three hundred eighty-one".

Divisors: 1 7 20483 143381