19493797 has 2 divisors, whose sum is σ = 19493798. Its totient is φ = 19493796.

The previous prime is 19493731. The next prime is 19493807. The reversal of 19493797 is 79739491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15163236 + 4330561 = 3894^2 + 2081^2 .

It is a cyclic number.

It is not a de Polignac number, because 19493797 - 2²³ = 11105189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19493797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19493197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9746898 + 9746899.

It is an arithmetic number, because the mean of its divisors is an integer number (9746899).

Almost surely, 2^19493797 is an apocalyptic number.

It is an amenable number.

19493797 is a deficient number, since it is larger than the sum of its proper divisors (1).

19493797 is an equidigital number, since it uses as much as digits as its factorization.

19493797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 428652, while the sum is 49.

The square root of 19493797 is about 4415.1780258558. The cubic root of 19493797 is about 269.1320873487.

The spelling of 19493797 in words is "nineteen million, four hundred ninety-three thousand, seven hundred ninety-seven".