19938790 has 32 divisors (see below), whose sum is σ = 40007520. Its totient is φ = 7110144.

The previous prime is 19938761. The next prime is 19938791. The reversal of 19938790 is 9783991.

It is a self number, because there is not a number n which added to its sum of digits gives 19938790.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19938791) 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 15 ways as a sum of consecutive naturals, for example, 144 + ... + 6316.

It is an arithmetic number, because the mean of its divisors is an integer number (1250235).

Almost surely, 2^19938790 is an apocalyptic number.

19938790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19938790 is an abundant number, since it is smaller than the sum of its proper divisors (20068730).

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

19938790 is a wasteful number, since it uses less digits than its factorization.

19938790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6216.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 19938790 is about 4465.2872248042. The cubic root of 19938790 is about 271.1645628407.

The spelling of 19938790 in words is "nineteen million, nine hundred thirty-eight thousand, seven hundred ninety".