19749144 has 16 divisors (see below), whose sum is σ = 49372920. Its totient is φ = 6583040.

The previous prime is 19749143. The next prime is 19749179. The reversal of 19749144 is 44194791.

It is a super-3 number, since 3×19749144³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19749143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411417 + ... + 411464.

Almost surely, 2^19749144 is an apocalyptic number.

It is an amenable number.

19749144 is an abundant number, since it is smaller than the sum of its proper divisors (29623776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19749144 is a wasteful number, since it uses less digits than its factorization.

19749144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822890 (or 822886 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 19749144 is about 4444.0009000899. Note that the first 3 decimals coincide. The cubic root of 19749144 is about 270.3021035506.

The spelling of 19749144 in words is "nineteen million, seven hundred forty-nine thousand, one hundred forty-four".