19798477 has 2 divisors, whose sum is σ = 19798478. Its totient is φ = 19798476.

The previous prime is 19798459. The next prime is 19798481. The reversal of 19798477 is 77489791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19412836 + 385641 = 4406^2 + 621^2 .

It is a cyclic number.

It is not a de Polignac number, because 19798477 - 2⁷ = 19798349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19798577) 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, 9899238 + 9899239.

It is an arithmetic number, because the mean of its divisors is an integer number (9899239).

Almost surely, 2^19798477 is an apocalyptic number.

It is an amenable number.

19798477 is a deficient number, since it is larger than the sum of its proper divisors (1).

19798477 is an equidigital number, since it uses as much as digits as its factorization.

19798477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 52.

The square root of 19798477 is about 4449.5479545680. The cubic root of 19798477 is about 270.5269863048.

The spelling of 19798477 in words is "nineteen million, seven hundred ninety-eight thousand, four hundred seventy-seven".