19990938149 has 16 divisors (see below), whose sum is σ = 24607672320. Its totient is φ = 15814794240.

The previous prime is 19990938127. The next prime is 19990938157. The reversal of 19990938149 is 94183909991.

It is a happy number.

It is not a de Polignac number, because 19990938149 - 2²⁸ = 19722502693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19990938091 and 19990938100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19990938109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1021244 + ... + 1040634.

It is an arithmetic number, because the mean of its divisors is an integer number (1537979520).

Almost surely, 2^19990938149 is an apocalyptic number.

It is an amenable number.

19990938149 is a deficient number, since it is larger than the sum of its proper divisors (4616734171).

19990938149 is a wasteful number, since it uses less digits than its factorization.

19990938149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30740.

The product of its (nonzero) digits is 5668704, while the sum is 62.

The spelling of 19990938149 in words is "nineteen billion, nine hundred ninety million, nine hundred thirty-eight thousand, one hundred forty-nine".