143840645 has 16 divisors (see below), whose sum is σ = 190913520. Its totient is φ = 103348224.

The previous prime is 143840591. The next prime is 143840657. The reversal of 143840645 is 546048341.

It can be written as a sum of positive squares in 8 ways, for example, as 3678724 + 140161921 = 1918^2 + 11839^2 .

It is a cyclic number.

It is not a de Polignac number, because 143840645 - 2²⁴ = 127063429 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27500 + ... + 32309.

It is an arithmetic number, because the mean of its divisors is an integer number (11932095).

Almost surely, 2^143840645 is an apocalyptic number.

It is an amenable number.

143840645 is a deficient number, since it is larger than the sum of its proper divisors (47072875).

143840645 is a wasteful number, since it uses less digits than its factorization.

143840645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59864.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 143840645 is about 11993.3583703648. The cubic root of 143840645 is about 523.9548610671.

Adding to 143840645 its reverse (546048341), we get a palindrome (689888986).

The spelling of 143840645 in words is "one hundred forty-three million, eight hundred forty thousand, six hundred forty-five".