19953919 has 2 divisors, whose sum is σ = 19953920. Its totient is φ = 19953918.

The previous prime is 19953907. The next prime is 19953953. The reversal of 19953919 is 91935991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19953919 - 2⁹ = 19953407 is a prime.

It is a super-2 number, since 2×19953919² = 796317766917122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19953959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9976959 + 9976960.

It is an arithmetic number, because the mean of its divisors is an integer number (9976960).

Almost surely, 2^19953919 is an apocalyptic number.

19953919 is a deficient number, since it is larger than the sum of its proper divisors (1).

19953919 is an equidigital number, since it uses as much as digits as its factorization.

19953919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98415, while the sum is 46.

The square root of 19953919 is about 4466.9809715288. The cubic root of 19953919 is about 271.2331295474.

The spelling of 19953919 in words is "nineteen million, nine hundred fifty-three thousand, nine hundred nineteen".