19789745 has 8 divisors (see below), whose sum is σ = 24566760. Its totient is φ = 15285760.

The previous prime is 19789727. The next prime is 19789747. The reversal of 19789745 is 54798791.

It can be written as a sum of positive squares in 4 ways, for example, as 5041 + 19784704 = 71^2 + 4448^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19789745 - 2⁸ = 19789489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19789693 and 19789702.

It is not an unprimeable number, because it can be changed into a prime (19789747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68096 + ... + 68385.

It is an arithmetic number, because the mean of its divisors is an integer number (3070845).

Almost surely, 2^19789745 is an apocalyptic number.

It is an amenable number.

19789745 is a deficient number, since it is larger than the sum of its proper divisors (4777015).

19789745 is a wasteful number, since it uses less digits than its factorization.

19789745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136515.

The product of its digits is 635040, while the sum is 50.

The square root of 19789745 is about 4448.5666230821. The cubic root of 19789745 is about 270.4872090193.

The spelling of 19789745 in words is "nineteen million, seven hundred eighty-nine thousand, seven hundred forty-five".