142278638 has 8 divisors (see below), whose sum is σ = 215490288. Its totient is φ = 70448544.

The previous prime is 142278637. The next prime is 142278641. The reversal of 142278638 is 836872241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×142278638² = 40486421662270088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 142278595 and 142278604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142278637) 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, 345131 + ... + 345542.

It is an arithmetic number, because the mean of its divisors is an integer number (26936286).

Almost surely, 2^142278638 is an apocalyptic number.

142278638 is a deficient number, since it is larger than the sum of its proper divisors (73211650).

142278638 is a wasteful number, since it uses less digits than its factorization.

142278638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690778.

The product of its digits is 129024, while the sum is 41.

The square root of 142278638 is about 11928.0609488718. The cubic root of 142278638 is about 522.0513618765.

The spelling of 142278638 in words is "one hundred forty-two million, two hundred seventy-eight thousand, six hundred thirty-eight".