142238435189890 has 64 divisors (see below), whose sum is σ = 279578115050976. Its totient is φ = 51785037545472.

The previous prime is 142238435189861. The next prime is 142238435189891. The reversal of 142238435189890 is 98981534832241.

It can be written as a sum of positive squares in 16 ways, for example, as 15262250196249 + 126976184993641 = 3906693^2 + 11268371^2 .

It is not an unprimeable number, because it can be changed into a prime (142238435189891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32253414 + ... + 36397246.

Almost surely, 2^{142238435189890} is an apocalyptic number.

142238435189890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

142238435189890 is a deficient number, since it is larger than the sum of its proper divisors (137339679861086).

142238435189890 is a wasteful number, since it uses less digits than its factorization.

142238435189890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4147543.

The product of its (nonzero) digits is 119439360, while the sum is 67.

The spelling of 142238435189890 in words is "one hundred forty-two trillion, two hundred thirty-eight billion, four hundred thirty-five million, one hundred eighty-nine thousand, eight hundred ninety".