19742807 has 4 divisors (see below), whose sum is σ = 22563216. Its totient is φ = 16922400.

The previous prime is 19742803. The next prime is 19742813. The reversal of 19742807 is 70824791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70824791 = 7331 ⋅9661.

It is a cyclic number.

It is not a de Polignac number, because 19742807 - 2² = 19742803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19742803) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1410194 + ... + 1410207.

It is an arithmetic number, because the mean of its divisors is an integer number (5640804).

Almost surely, 2^19742807 is an apocalyptic number.

19742807 is a deficient number, since it is larger than the sum of its proper divisors (2820409).

19742807 is an equidigital number, since it uses as much as digits as its factorization.

19742807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820408.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 19742807 is about 4443.2878592322. The cubic root of 19742807 is about 270.2731894253.

The spelling of 19742807 in words is "nineteen million, seven hundred forty-two thousand, eight hundred seven".