838642646 has 4 divisors (see below), whose sum is σ = 1257963972. Its totient is φ = 419321322.

The previous prime is 838642643. The next prime is 838642663. The reversal of 838642646 is 646246838.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 838642646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838642643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209660660 + ... + 209660663.

It is an arithmetic number, because the mean of its divisors is an integer number (314490993).

Almost surely, 2^838642646 is an apocalyptic number.

838642646 is a deficient number, since it is larger than the sum of its proper divisors (419321326).

838642646 is a wasteful number, since it uses less digits than its factorization.

838642646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419321325.

The product of its digits is 1327104, while the sum is 47.

The square root of 838642646 is about 28959.3274438479. The cubic root of 838642646 is about 943.0303013751.

The spelling of 838642646 in words is "eight hundred thirty-eight million, six hundred forty-two thousand, six hundred forty-six".