340040642 has 4 divisors (see below), whose sum is σ = 510060966. Its totient is φ = 170020320.

The previous prime is 340040641. The next prime is 340040683. The reversal of 340040642 is 246040043.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246040043 = 269 ⋅914647.

It can be written as a sum of positive squares in only one way, i.e., 337787641 + 2253001 = 18379^2 + 1501^2 .

It is not an unprimeable number, because it can be changed into a prime (340040641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85010159 + ... + 85010162.

Almost surely, 2^340040642 is an apocalyptic number.

340040642 is a deficient number, since it is larger than the sum of its proper divisors (170020324).

340040642 is a wasteful number, since it uses less digits than its factorization.

340040642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170020323.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 340040642 is about 18440.1909426123. The cubic root of 340040642 is about 697.9810135967.

Adding to 340040642 its reverse (246040043), we get a palindrome (586080685).

The spelling of 340040642 in words is "three hundred forty million, forty thousand, six hundred forty-two".