19992519 has 6 divisors (see below), whose sum is σ = 28878096. Its totient is φ = 13328340.

The previous prime is 19992517. The next prime is 19992521. The reversal of 19992519 is 91529991.

It is an interprime number because it is at equal distance from previous prime (19992517) and next prime (19992521).

It is not a de Polignac number, because 19992519 - 2¹ = 19992517 is a prime.

It is a super-2 number, since 2×19992519² = 799401631930722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19992517) 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 in 5 ways as a sum of consecutive naturals, for example, 1110687 + ... + 1110704.

It is an arithmetic number, because the mean of its divisors is an integer number (4813016).

Almost surely, 2^19992519 is an apocalyptic number.

19992519 is a deficient number, since it is larger than the sum of its proper divisors (8885577).

19992519 is a wasteful number, since it uses less digits than its factorization.

19992519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221397 (or 2221394 counting only the distinct ones).

The product of its digits is 65610, while the sum is 45.

The square root of 19992519 is about 4471.2994755440. The cubic root of 19992519 is about 271.4079131751.

The spelling of 19992519 in words is "nineteen million, nine hundred ninety-two thousand, five hundred nineteen".