19944765 has 16 divisors (see below), whose sum is σ = 35457600. Its totient is φ = 10637136.

The previous prime is 19944763. The next prime is 19944797. The reversal of 19944765 is 56744991.

It is not a de Polignac number, because 19944765 - 2¹ = 19944763 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is a self number, because there is not a number n which added to its sum of digits gives 19944765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19944763) 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, 73735 + ... + 74004.

It is an arithmetic number, because the mean of its divisors is an integer number (2216100).

Almost surely, 2^19944765 is an apocalyptic number.

19944765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19944765 is a deficient number, since it is larger than the sum of its proper divisors (15512835).

19944765 is a wasteful number, since it uses less digits than its factorization.

19944765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147753 (or 147747 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 19944765 is about 4465.9562245951. The cubic root of 19944765 is about 271.1916465044.

It can be divided in two parts, 19 and 944765, that added together give a square (944784 = 972²).

The spelling of 19944765 in words is "nineteen million, nine hundred forty-four thousand, seven hundred sixty-five".