19913930 has 16 divisors (see below), whose sum is σ = 36028800. Its totient is φ = 7924752.

The previous prime is 19913921. The next prime is 19913939. The reversal of 19913930 is 3931991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19913921) and next prime (19913939).

It is not an unprimeable number, because it can be changed into a prime (19913939) 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, 3014 + ... + 6993.

It is an arithmetic number, because the mean of its divisors is an integer number (2251800).

Almost surely, 2^19913930 is an apocalyptic number.

19913930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19913930 is a deficient number, since it is larger than the sum of its proper divisors (16114870).

19913930 is a wasteful number, since it uses less digits than its factorization.

19913930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10213.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 19913930 is about 4462.5026610636. The cubic root of 19913930 is about 271.0518185429.

The spelling of 19913930 in words is "nineteen million, nine hundred thirteen thousand, nine hundred thirty".