143642638 has 4 divisors (see below), whose sum is σ = 215463960. Its totient is φ = 71821318.

The previous prime is 143642633. The next prime is 143642663. The reversal of 143642638 is 836246341.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 143642597 and 143642606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143642633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35910658 + ... + 35910661.

It is an arithmetic number, because the mean of its divisors is an integer number (53865990).

Almost surely, 2^143642638 is an apocalyptic number.

143642638 is a deficient number, since it is larger than the sum of its proper divisors (71821322).

143642638 is an equidigital number, since it uses as much as digits as its factorization.

143642638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71821321.

The product of its digits is 82944, while the sum is 37.

The square root of 143642638 is about 11985.1006670783. The cubic root of 143642638 is about 523.7143301389.

Adding to 143642638 its reverse (836246341), we get a palindrome (979888979).

The spelling of 143642638 in words is "one hundred forty-three million, six hundred forty-two thousand, six hundred thirty-eight".