813736442 has 4 divisors (see below), whose sum is σ = 1220604666. Its totient is φ = 406868220.

The previous prime is 813736439. The next prime is 813736447. The reversal of 813736442 is 244637318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244637318 = 2 ⋅122318659.

It can be written as a sum of positive squares in only one way, i.e., 467813641 + 345922801 = 21629^2 + 18599^2 .

It is a junction number, because it is equal to n+sod(n) for n = 813736396 and 813736405.

It is not an unprimeable number, because it can be changed into a prime (813736447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203434109 + ... + 203434112.

Almost surely, 2^813736442 is an apocalyptic number.

813736442 is a deficient number, since it is larger than the sum of its proper divisors (406868224).

813736442 is a wasteful number, since it uses less digits than its factorization.

813736442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406868223.

The product of its digits is 96768, while the sum is 38.

The square root of 813736442 is about 28526.0660098795. The cubic root of 813736442 is about 933.6008860785.

The spelling of 813736442 in words is "eight hundred thirteen million, seven hundred thirty-six thousand, four hundred forty-two".