19780253 has 4 divisors (see below), whose sum is σ = 20640288. Its totient is φ = 18920220.

The previous prime is 19780247. The next prime is 19780259. The reversal of 19780253 is 35208791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (19780247) and next prime (19780259).

It is a cyclic number.

It is not a de Polignac number, because 19780253 - 2¹² = 19776157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19780259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429983 + ... + 430028.

It is an arithmetic number, because the mean of its divisors is an integer number (5160072).

Almost surely, 2^19780253 is an apocalyptic number.

It is an amenable number.

19780253 is a deficient number, since it is larger than the sum of its proper divisors (860035).

19780253 is an equidigital number, since it uses as much as digits as its factorization.

19780253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860034.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 19780253 is about 4447.4996346262. The cubic root of 19780253 is about 270.4439563955.

The spelling of 19780253 in words is "nineteen million, seven hundred eighty thousand, two hundred fifty-three".