142278444 has 144 divisors (see below), whose sum is σ = 465244416. Its totient is φ = 36936000.

The previous prime is 142278427. The next prime is 142278497. The reversal of 142278444 is 444872241.

142278444 is a `hidden beast` number, since 142 + 2 + 78 + 444 = 666.

It is a super-2 number, since 2×142278444² = 40486311254122272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 142278399 and 142278408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 73894 + ... + 75794.

It is an arithmetic number, because the mean of its divisors is an integer number (3230864).

Almost surely, 2^142278444 is an apocalyptic number.

142278444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 142278444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232622208).

142278444 is an abundant number, since it is smaller than the sum of its proper divisors (322965972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

142278444 is a wasteful number, since it uses less digits than its factorization.

142278444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938 (or 1924 counting only the distinct ones).

The product of its digits is 57344, while the sum is 36.

The square root of 142278444 is about 11928.0528167845. The cubic root of 142278444 is about 522.0511246003.

The spelling of 142278444 in words is "one hundred forty-two million, two hundred seventy-eight thousand, four hundred forty-four".