19009899 has 18 divisors (see below), whose sum is σ = 28984956. Its totient is φ = 12004200.

The previous prime is 19009889. The next prime is 19009901. The reversal of 19009899 is 99890091.

It is not a de Polignac number, because 19009899 - 2⁸ = 19009643 is a prime.

It is a super-2 number, since 2×19009899² = 722752519980402, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19009889) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 324 + ... + 6174.

Almost surely, 2^19009899 is an apocalyptic number.

19009899 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

19009899 is a deficient number, since it is larger than the sum of its proper divisors (9975057).

19009899 is a wasteful number, since it uses less digits than its factorization.

19009899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5895 (or 5873 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 19009899 is about 4360.0342888560. The cubic root of 19009899 is about 266.8864980686.

The spelling of 19009899 in words is "nineteen million, nine thousand, eight hundred ninety-nine".