679397842 has 4 divisors (see below), whose sum is σ = 1019096766. Its totient is φ = 339698920.

The previous prime is 679397837. The next prime is 679397879. The reversal of 679397842 is 248793976.

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., 505395361 + 174002481 = 22481^2 + 13191^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169849459 + ... + 169849462.

Almost surely, 2^679397842 is an apocalyptic number.

679397842 is a deficient number, since it is larger than the sum of its proper divisors (339698924).

679397842 is a wasteful number, since it uses less digits than its factorization.

679397842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339698923.

The product of its digits is 4572288, while the sum is 55.

The square root of 679397842 is about 26065.2612110449. The cubic root of 679397842 is about 879.1062905053.

The spelling of 679397842 in words is "six hundred seventy-nine million, three hundred ninety-seven thousand, eight hundred forty-two".