19940045 has 6 divisors (see below), whose sum is σ = 23940042. Its totient is φ = 15944048.

The previous prime is 19940033. The next prime is 19940047. The reversal of 19940045 is 54004991.

It can be written as a sum of positive squares in 3 ways, for example, as 1800964 + 18139081 = 1342^2 + 4259^2 .

It is not a de Polignac number, because 19940045 - 2¹⁰ = 19939021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19939993 and 19940020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19940047) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8987 + ... + 10983.

It is an arithmetic number, because the mean of its divisors is an integer number (3990007).

Almost surely, 2^19940045 is an apocalyptic number.

It is an amenable number.

19940045 is a deficient number, since it is larger than the sum of its proper divisors (3999997).

19940045 is an frugal number, since it uses more digits than its factorization.

19940045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999 (or 2002 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 19940045 is about 4465.4277510671. The cubic root of 19940045 is about 271.1702519921.

Multiplying 19940045 by its product of nonzero digits (6480), we get a square (129211491600 = 359460²).

The spelling of 19940045 in words is "nineteen million, nine hundred forty thousand, forty-five".