19742865 has 32 divisors (see below), whose sum is σ = 33747840. Its totient is φ = 9821184.

The previous prime is 19742813. The next prime is 19742869. The reversal of 19742865 is 56824791.

It is not a de Polignac number, because 19742865 - 2⁸ = 19742609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19742869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35167 + ... + 35723.

It is an arithmetic number, because the mean of its divisors is an integer number (1054620).

Almost surely, 2^19742865 is an apocalyptic number.

19742865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19742865 is a deficient number, since it is larger than the sum of its proper divisors (14004975).

19742865 is a wasteful number, since it uses less digits than its factorization.

19742865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721.

The product of its digits is 120960, while the sum is 42.

The square root of 19742865 is about 4443.2943859258. The cubic root of 19742865 is about 270.2734540927.

The spelling of 19742865 in words is "nineteen million, seven hundred forty-two thousand, eight hundred sixty-five".