340742434 has 4 divisors (see below), whose sum is σ = 511113654. Its totient is φ = 170371216.

The previous prime is 340742411. The next prime is 340742443. The reversal of 340742434 is 434247043.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 434247043 = 2243 ⋅193601.

It can be written as a sum of positive squares in only one way, i.e., 305375625 + 35366809 = 17475^2 + 5947^2 .

It is a super-2 number, since 2×340742434² = 232210812656488712, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) 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 = 340742396 and 340742405.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85185607 + ... + 85185610.

Almost surely, 2^340742434 is an apocalyptic number.

340742434 is a deficient number, since it is larger than the sum of its proper divisors (170371220).

340742434 is a wasteful number, since it uses less digits than its factorization.

340742434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170371219.

The product of its (nonzero) digits is 32256, while the sum is 31.

The square root of 340742434 is about 18459.2100047646. The cubic root of 340742434 is about 698.4608590756.

Adding to 340742434 its reverse (434247043), we get a palindrome (774989477).

The spelling of 340742434 in words is "three hundred forty million, seven hundred forty-two thousand, four hundred thirty-four".