817400242 has 4 divisors (see below), whose sum is σ = 1226100366. Its totient is φ = 408700120.

The previous prime is 817400237. The next prime is 817400251. The reversal of 817400242 is 242004718.

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., 542470681 + 274929561 = 23291^2 + 16581^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 817400242.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204350059 + ... + 204350062.

Almost surely, 2^817400242 is an apocalyptic number.

817400242 is a deficient number, since it is larger than the sum of its proper divisors (408700124).

817400242 is a wasteful number, since it uses less digits than its factorization.

817400242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408700123.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 817400242 is about 28590.2123461859. The cubic root of 817400242 is about 934.9999492884. Note that the first 4 decimals are identical.

The spelling of 817400242 in words is "eight hundred seventeen million, four hundred thousand, two hundred forty-two".