2178617242 has 4 divisors (see below), whose sum is σ = 3267925866. Its totient is φ = 1089308620.

The previous prime is 2178617237. The next prime is 2178617249. The reversal of 2178617242 is 2427168712.

2178617242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 1935912001 + 242705241 = 43999^2 + 15579^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 2178617195 and 2178617204.

It is not an unprimeable number, because it can be changed into a prime (2178617249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544654309 + ... + 544654312.

Almost surely, 2^2178617242 is an apocalyptic number.

2178617242 is a deficient number, since it is larger than the sum of its proper divisors (1089308624).

2178617242 is a wasteful number, since it uses less digits than its factorization.

2178617242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089308623.

The product of its digits is 75264, while the sum is 40.

The square root of 2178617242 is about 46675.6600596071. The cubic root of 2178617242 is about 1296.3640496135.

The spelling of 2178617242 in words is "two billion, one hundred seventy-eight million, six hundred seventeen thousand, two hundred forty-two".