19477949 has 2 divisors, whose sum is σ = 19477950. Its totient is φ = 19477948.

The previous prime is 19477901. The next prime is 19477957. The reversal of 19477949 is 94977491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15405625 + 4072324 = 3925^2 + 2018^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19477949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19477897 and 19477906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19477999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9738974 + 9738975.

It is an arithmetic number, because the mean of its divisors is an integer number (9738975).

Almost surely, 2^19477949 is an apocalyptic number.

It is an amenable number.

19477949 is a deficient number, since it is larger than the sum of its proper divisors (1).

19477949 is an equidigital number, since it uses as much as digits as its factorization.

19477949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 50.

The square root of 19477949 is about 4413.3829428229. The cubic root of 19477949 is about 269.0591348828.

The spelling of 19477949 in words is "nineteen million, four hundred seventy-seven thousand, nine hundred forty-nine".