19860245 has 6 divisors (see below), whose sum is σ = 23844258. Its totient is φ = 15880224.

The previous prime is 19860209. The next prime is 19860259. The reversal of 19860245 is 54206891.

It can be written as a sum of positive squares in 3 ways, for example, as 5654884 + 14205361 = 2378^2 + 3769^2 .

It is not a de Polignac number, because 19860245 - 2¹² = 19856149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8969 + ... + 10961.

It is an arithmetic number, because the mean of its divisors is an integer number (3974043).

Almost surely, 2^19860245 is an apocalyptic number.

It is an amenable number.

19860245 is a deficient number, since it is larger than the sum of its proper divisors (3984013).

19860245 is an frugal number, since it uses more digits than its factorization.

19860245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3991 (or 1998 counting only the distinct ones).

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

The square root of 19860245 is about 4456.4834791571. The cubic root of 19860245 is about 270.8080275107.

The spelling of 19860245 in words is "nineteen million, eight hundred sixty thousand, two hundred forty-five".