838999990 has 16 divisors (see below), whose sum is σ = 1510535952. Its totient is φ = 335525344.

The previous prime is 838999949. The next prime is 838999991. The reversal of 838999990 is 99999838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838999991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69912 + ... + 81028.

It is an arithmetic number, because the mean of its divisors is an integer number (94408497).

Almost surely, 2^838999990 is an apocalyptic number.

838999990 is a deficient number, since it is larger than the sum of its proper divisors (671535962).

838999990 is a wasteful number, since it uses less digits than its factorization.

838999990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18671.

The product of its (nonzero) digits is 11337408, while the sum is 64.

The square root of 838999990 is about 28965.4965433013. The cubic root of 838999990 is about 943.1642234812.

The spelling of 838999990 in words is "eight hundred thirty-eight million, nine hundred ninety-nine thousand, nine hundred ninety".