19713765 has 16 divisors (see below), whose sum is σ = 32630400. Its totient is φ = 10151232.

The previous prime is 19713763. The next prime is 19713769. The reversal of 19713765 is 56731791.

It is not a de Polignac number, because 19713765 - 2¹ = 19713763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19713763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22225 + ... + 23094.

It is an arithmetic number, because the mean of its divisors is an integer number (2039400).

Almost surely, 2^19713765 is an apocalyptic number.

19713765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19713765 is a deficient number, since it is larger than the sum of its proper divisors (12916635).

19713765 is a wasteful number, since it uses less digits than its factorization.

19713765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45356.

The product of its digits is 39690, while the sum is 39.

The square root of 19713765 is about 4440.0185810422. The cubic root of 19713765 is about 270.1405989259.

The spelling of 19713765 in words is "nineteen million, seven hundred thirteen thousand, seven hundred sixty-five".