19995425 has 6 divisors (see below), whose sum is σ = 24794358. Its totient is φ = 15996320.

The previous prime is 19995421. The next prime is 19995427. The reversal of 19995425 is 52459991.

It can be written as a sum of positive squares in 3 ways, for example, as 2347024 + 17648401 = 1532^2 + 4201^2 .

It is not a de Polignac number, because 19995425 - 2² = 19995421 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19995421) 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, 399884 + ... + 399933.

It is an arithmetic number, because the mean of its divisors is an integer number (4132393).

Almost surely, 2^19995425 is an apocalyptic number.

It is an amenable number.

19995425 is a deficient number, since it is larger than the sum of its proper divisors (4798933).

19995425 is an equidigital number, since it uses as much as digits as its factorization.

19995425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799827 (or 799822 counting only the distinct ones).

The product of its digits is 145800, while the sum is 44.

The square root of 19995425 is about 4471.6244251949. The cubic root of 19995425 is about 271.4210626468.

The spelling of 19995425 in words is "nineteen million, nine hundred ninety-five thousand, four hundred twenty-five".