19640825 has 12 divisors (see below), whose sum is σ = 25141248. Its totient is φ = 15205200.

The previous prime is 19640807. The next prime is 19640833. The reversal of 19640825 is 52804691.

It is not a de Polignac number, because 19640825 - 2¹⁴ = 19624441 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11897 + ... + 13446.

It is an arithmetic number, because the mean of its divisors is an integer number (2095104).

Almost surely, 2^19640825 is an apocalyptic number.

It is an amenable number.

19640825 is a deficient number, since it is larger than the sum of its proper divisors (5500423).

19640825 is a wasteful number, since it uses less digits than its factorization.

19640825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25384 (or 25379 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 19640825 is about 4431.7970395766. The cubic root of 19640825 is about 269.8070180207.

The spelling of 19640825 in words is "nineteen million, six hundred forty thousand, eight hundred twenty-five".