342815978 has 24 divisors (see below), whose sum is σ = 529082400. Its totient is φ = 166583664.

The previous prime is 342815969. The next prime is 342815981. The reversal of 342815978 is 879518243.

It is a happy number.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 780683 + ... + 781121.

It is an arithmetic number, because the mean of its divisors is an integer number (22045100).

Almost surely, 2^342815978 is an apocalyptic number.

342815978 is a deficient number, since it is larger than the sum of its proper divisors (186266422).

342815978 is a wasteful number, since it uses less digits than its factorization.

342815978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686 (or 633 counting only the distinct ones).

The product of its digits is 483840, while the sum is 47.

The square root of 342815978 is about 18515.2903838962. The cubic root of 342815978 is about 699.8747925718.

The spelling of 342815978 in words is "three hundred forty-two million, eight hundred fifteen thousand, nine hundred seventy-eight".