19385990 has 24 divisors (see below), whose sum is σ = 37788768. Its totient is φ = 7157280.

The previous prime is 19385963. The next prime is 19385999. The reversal of 19385990 is 9958391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19385999) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 4046 + ... + 7425.

It is an arithmetic number, because the mean of its divisors is an integer number (1574532).

Almost surely, 2^19385990 is an apocalyptic number.

19385990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19385990 is a deficient number, since it is larger than the sum of its proper divisors (18402778).

19385990 is a wasteful number, since it uses less digits than its factorization.

19385990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11504 (or 11491 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 19385990 is about 4402.9524185483. The cubic root of 19385990 is about 268.6350407911.

The spelling of 19385990 in words is "nineteen million, three hundred eighty-five thousand, nine hundred ninety".