19999340 has 24 divisors (see below), whose sum is σ = 43354752. Its totient is φ = 7741440.

The previous prime is 19999339. The next prime is 19999373. The reversal of 19999340 is 4399991.

It is a junction number, because it is equal to n+sod(n) for n = 19999291 and 19999300.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15509 + ... + 16748.

It is an arithmetic number, because the mean of its divisors is an integer number (1806448).

Almost surely, 2^19999340 is an apocalyptic number.

19999340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19999340 is an abundant number, since it is smaller than the sum of its proper divisors (23355412).

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

19999340 is a wasteful number, since it uses less digits than its factorization.

19999340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32297 (or 32295 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 19999340 is about 4472.0621641475. The cubic root of 19999340 is about 271.4387757673.

The spelling of 19999340 in words is "nineteen million, nine hundred ninety-nine thousand, three hundred forty".