19799730 has 48 divisors (see below), whose sum is σ = 54511704. Its totient is φ = 4968960.

The previous prime is 19799723. The next prime is 19799749. The reversal of 19799730 is 3799791.

It can be written as a sum of positive squares in 4 ways, for example, as 19158129 + 641601 = 4377^2 + 801^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 4941 + ... + 8000.

Almost surely, 2^19799730 is an apocalyptic number.

19799730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19799730 is an abundant number, since it is smaller than the sum of its proper divisors (34711974).

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

19799730 is a wasteful number, since it uses less digits than its factorization.

19799730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12971 (or 12968 counting only the distinct ones).

The product of its (nonzero) digits is 107163, while the sum is 45.

The square root of 19799730 is about 4449.6887531602. The cubic root of 19799730 is about 270.5326931943.

The spelling of 19799730 in words is "nineteen million, seven hundred ninety-nine thousand, seven hundred thirty".