340040042 has 4 divisors (see below), whose sum is σ = 510060066. Its totient is φ = 170020020.

The previous prime is 340040021. The next prime is 340040053. The reversal of 340040042 is 240040043.

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., 182763361 + 157276681 = 13519^2 + 12541^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 340040042.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85010009 + ... + 85010012.

Almost surely, 2^340040042 is an apocalyptic number.

340040042 is a deficient number, since it is larger than the sum of its proper divisors (170020024).

340040042 is a wasteful number, since it uses less digits than its factorization.

340040042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170020023.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 340040042 is about 18440.1746737931. The cubic root of 340040042 is about 697.9806030685.

Adding to 340040042 its reverse (240040043), we get a palindrome (580080085).

Subtracting from 340040042 its reverse (240040043), we obtain a palindrome (99999999).

The spelling of 340040042 in words is "three hundred forty million, forty thousand, forty-two".