219079642 has 4 divisors (see below), whose sum is σ = 328619466. Its totient is φ = 109539820.

The previous prime is 219079631. The next prime is 219079657. The reversal of 219079642 is 246970912.

219079642 is digitally balanced in base 3, 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., 186349801 + 32729841 = 13651^2 + 5721^2 .

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 = 219079595 and 219079604.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54769909 + ... + 54769912.

Almost surely, 2^219079642 is an apocalyptic number.

219079642 is a deficient number, since it is larger than the sum of its proper divisors (109539824).

219079642 is a wasteful number, since it uses less digits than its factorization.

219079642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109539823.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 219079642 is about 14801.3391961674. The cubic root of 219079642 is about 602.8380747567.

The spelling of 219079642 in words is "two hundred nineteen million, seventy-nine thousand, six hundred forty-two".