2178239142 has 8 divisors (see below), whose sum is σ = 4356478296. Its totient is φ = 726079712.

The previous prime is 2178239131. The next prime is 2178239143. The reversal of 2178239142 is 2419328712.

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

2178239142 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 2178239142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178239143) 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, 181519923 + ... + 181519934.

It is an arithmetic number, because the mean of its divisors is an integer number (544559787).

Almost surely, 2^2178239142 is an apocalyptic number.

2178239142 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2178239142 is a wasteful number, since it uses less digits than its factorization.

2178239142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363039862.

The product of its digits is 48384, while the sum is 39.

The square root of 2178239142 is about 46671.6095929849. The cubic root of 2178239142 is about 1296.2890504204.

The spelling of 2178239142 in words is "two billion, one hundred seventy-eight million, two hundred thirty-nine thousand, one hundred forty-two".