19749730 has 64 divisors (see below), whose sum is σ = 47755008. Its totient is φ = 5679360.

The previous prime is 19749727. The next prime is 19749731. The reversal of 19749730 is 3794791.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (19749731) 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 31 ways as a sum of consecutive naturals, for example, 9024 + ... + 10996.

It is an arithmetic number, because the mean of its divisors is an integer number (746172).

Almost surely, 2^19749730 is an apocalyptic number.

19749730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19749730 is an abundant number, since it is smaller than the sum of its proper divisors (28005278).

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

19749730 is a wasteful number, since it uses less digits than its factorization.

19749730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 19749730 is about 4444.0668311806. The cubic root of 19749730 is about 270.3047770077.

The spelling of 19749730 in words is "nineteen million, seven hundred forty-nine thousand, seven hundred thirty".