19890374 has 24 divisors (see below), whose sum is σ = 36751320. Its totient is φ = 8022336.

The previous prime is 19890347. The next prime is 19890379. The reversal of 19890374 is 47309891.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19890379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4304 + ... + 7635.

It is an arithmetic number, because the mean of its divisors is an integer number (1531305).

Almost surely, 2^19890374 is an apocalyptic number.

19890374 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19890374 is a deficient number, since it is larger than the sum of its proper divisors (16860946).

19890374 is a wasteful number, since it uses less digits than its factorization.

19890374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11972 (or 11965 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 19890374 is about 4459.8625539359. The cubic root of 19890374 is about 270.9449014947.

The spelling of 19890374 in words is "nineteen million, eight hundred ninety thousand, three hundred seventy-four".