19782493 has 2 divisors, whose sum is σ = 19782494. Its totient is φ = 19782492.

The previous prime is 19782479. The next prime is 19782527. The reversal of 19782493 is 39428791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13089924 + 6692569 = 3618^2 + 2587^2 .

It is a cyclic number.

It is not a de Polignac number, because 19782493 - 2⁹ = 19781981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19782403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9891246 + 9891247.

It is an arithmetic number, because the mean of its divisors is an integer number (9891247).

Almost surely, 2^19782493 is an apocalyptic number.

It is an amenable number.

19782493 is a deficient number, since it is larger than the sum of its proper divisors (1).

19782493 is an equidigital number, since it uses as much as digits as its factorization.

19782493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 19782493 is about 4447.7514543868. The cubic root of 19782493 is about 270.4541647516.

The spelling of 19782493 in words is "nineteen million, seven hundred eighty-two thousand, four hundred ninety-three".