340392406 has 4 divisors (see below), whose sum is σ = 510588612. Its totient is φ = 170196202.

The previous prime is 340392397. The next prime is 340392421. The reversal of 340392406 is 604293043.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604293043 = 19 ⋅31804897.

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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85098100 + ... + 85098103.

It is an arithmetic number, because the mean of its divisors is an integer number (127647153).

Almost surely, 2^340392406 is an apocalyptic number.

340392406 is a deficient number, since it is larger than the sum of its proper divisors (170196206).

340392406 is a wasteful number, since it uses less digits than its factorization.

340392406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170196205.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 340392406 is about 18449.7264478366. The cubic root of 340392406 is about 698.2216122669.

The spelling of 340392406 in words is "three hundred forty million, three hundred ninety-two thousand, four hundred six".