816284542 has 4 divisors (see below), whose sum is σ = 1224426816. Its totient is φ = 408142270.

The previous prime is 816284537. The next prime is 816284543. The reversal of 816284542 is 245482618.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 816284495 and 816284504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816284543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204071134 + ... + 204071137.

It is an arithmetic number, because the mean of its divisors is an integer number (306106704).

Almost surely, 2^816284542 is an apocalyptic number.

816284542 is a deficient number, since it is larger than the sum of its proper divisors (408142274).

816284542 is a wasteful number, since it uses less digits than its factorization.

816284542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408142273.

The product of its digits is 122880, while the sum is 40.

The square root of 816284542 is about 28570.6937612652. The cubic root of 816284542 is about 934.5743501858.

The spelling of 816284542 in words is "eight hundred sixteen million, two hundred eighty-four thousand, five hundred forty-two".