19949953 has 2 divisors, whose sum is σ = 19949954. Its totient is φ = 19949952.

The previous prime is 19949939. The next prime is 19949977. The reversal of 19949953 is 35994991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18122049 + 1827904 = 4257^2 + 1352^2 .

It is a cyclic number.

It is not a de Polignac number, because 19949953 - 2⁵ = 19949921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19949897 and 19949906.

It is not a weakly prime, because it can be changed into another prime (19949933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9974976 + 9974977.

It is an arithmetic number, because the mean of its divisors is an integer number (9974977).

Almost surely, 2^19949953 is an apocalyptic number.

It is an amenable number.

19949953 is a deficient number, since it is larger than the sum of its proper divisors (1).

19949953 is an equidigital number, since it uses as much as digits as its factorization.

19949953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 393660, while the sum is 49.

The square root of 19949953 is about 4466.5370254818. The cubic root of 19949953 is about 271.2151584433.

It can be divided in two parts, 19949 and 953, that added together give a palindrome (20902).

The spelling of 19949953 in words is "nineteen million, nine hundred forty-nine thousand, nine hundred fifty-three".