812207638 has 16 divisors (see below), whose sum is σ = 1329650640. Its totient is φ = 369023200.

The previous prime is 812207621. The next prime is 812207653. The reversal of 812207638 is 836702218.

It is a junction number, because it is equal to n+sod(n) for n = 812207597 and 812207606.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 53568 + ... + 67036.

It is an arithmetic number, because the mean of its divisors is an integer number (83103165).

Almost surely, 2^812207638 is an apocalyptic number.

812207638 is a deficient number, since it is larger than the sum of its proper divisors (517443002).

812207638 is a wasteful number, since it uses less digits than its factorization.

812207638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16223.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 812207638 is about 28499.2567973272. The cubic root of 812207638 is about 933.0158532719.

The spelling of 812207638 in words is "eight hundred twelve million, two hundred seven thousand, six hundred thirty-eight".