19640473 has 2 divisors, whose sum is σ = 19640474. Its totient is φ = 19640472.

The previous prime is 19640461. The next prime is 19640479. The reversal of 19640473 is 37404691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18939904 + 700569 = 4352^2 + 837^2 .

It is a cyclic number.

It is not a de Polignac number, because 19640473 - 2⁵ = 19640441 is a prime.

It is not a weakly prime, because it can be changed into another prime (19640479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9820236 + 9820237.

It is an arithmetic number, because the mean of its divisors is an integer number (9820237).

Almost surely, 2^19640473 is an apocalyptic number.

It is an amenable number.

19640473 is a deficient number, since it is larger than the sum of its proper divisors (1).

19640473 is an equidigital number, since it uses as much as digits as its factorization.

19640473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 19640473 is about 4431.7573263887. The cubic root of 19640473 is about 269.8054061971.

The spelling of 19640473 in words is "nineteen million, six hundred forty thousand, four hundred seventy-three".