849997638 has 40 divisors (see below), whose sum is σ = 2176716432. Its totient is φ = 242856144.

The previous prime is 849997583. The next prime is 849997651. The reversal of 849997638 is 836799948.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 373645 + ... + 375912.

Almost surely, 2^849997638 is an apocalyptic number.

849997638 is an abundant number, since it is smaller than the sum of its proper divisors (1326718794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

849997638 is a wasteful number, since it uses less digits than its factorization.

849997638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749578 (or 749569 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 63.

The square root of 849997638 is about 29154.7189662326. The cubic root of 849997638 is about 947.2673597547.

The spelling of 849997638 in words is "eight hundred forty-nine million, nine hundred ninety-seven thousand, six hundred thirty-eight".