19785461 has 4 divisors (see below), whose sum is σ = 20245632. Its totient is φ = 19325292.

The previous prime is 19785443. The next prime is 19785487. The reversal of 19785461 is 16458791.

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 a cyclic number.

It is not a de Polignac number, because 19785461 - 2²² = 15591157 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 (19785401) 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, 230021 + ... + 230106.

It is an arithmetic number, because the mean of its divisors is an integer number (5061408).

Almost surely, 2^19785461 is an apocalyptic number.

It is an amenable number.

19785461 is a deficient number, since it is larger than the sum of its proper divisors (460171).

19785461 is an equidigital number, since it uses as much as digits as its factorization.

19785461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460170.

The product of its digits is 60480, while the sum is 41.

The square root of 19785461 is about 4448.0850936105. The cubic root of 19785461 is about 270.4676896364.

It can be divided in two parts, 197 and 85461, that added together give a palindrome (85658).

The spelling of 19785461 in words is "nineteen million, seven hundred eighty-five thousand, four hundred sixty-one".