19406945 has 16 divisors (see below), whose sum is σ = 25511760. Its totient is φ = 14106624.

The previous prime is 19406941. The next prime is 19406987. The reversal of 19406945 is 54960491.

It can be written as a sum of positive squares in 8 ways, for example, as 891136 + 18515809 = 944^2 + 4303^2 .

It is a cyclic number.

It is not a de Polignac number, because 19406945 - 2² = 19406941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19406899 and 19406908.

It is not an unprimeable number, because it can be changed into a prime (19406941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1472 + ... + 6401.

It is an arithmetic number, because the mean of its divisors is an integer number (1594485).

Almost surely, 2^19406945 is an apocalyptic number.

It is an amenable number.

19406945 is a deficient number, since it is larger than the sum of its proper divisors (6104815).

19406945 is a wasteful number, since it uses less digits than its factorization.

19406945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7924.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 19406945 is about 4405.3314290755. The cubic root of 19406945 is about 268.7317982986.

The spelling of 19406945 in words is "nineteen million, four hundred six thousand, nine hundred forty-five".