19018945 has 16 divisors (see below), whose sum is σ = 25323840. Its totient is φ = 13595200.

The previous prime is 19018939. The next prime is 19018949. The reversal of 19018945 is 54981091.

It is not a de Polignac number, because 19018945 - 2⁵ = 19018913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19018949) 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, 315 + ... + 6175.

It is an arithmetic number, because the mean of its divisors is an integer number (1582740).

Almost surely, 2^19018945 is an apocalyptic number.

It is an amenable number.

19018945 is a deficient number, since it is larger than the sum of its proper divisors (6304895).

19018945 is a wasteful number, since it uses less digits than its factorization.

19018945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5936.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 19018945 is about 4361.0715426372. The cubic root of 19018945 is about 266.9288246553.

The spelling of 19018945 in words is "nineteen million, eighteen thousand, nine hundred forty-five".