19709144 has 32 divisors (see below), whose sum is σ = 45484320. Its totient is φ = 7796736.

The previous prime is 19709141. The next prime is 19709147. The reversal of 19709144 is 44190791.

It is an interprime number because it is at equal distance from previous prime (19709141) and next prime (19709147).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19709141) 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 7 ways as a sum of consecutive naturals, for example, 12809 + ... + 14264.

It is an arithmetic number, because the mean of its divisors is an integer number (1421385).

Almost surely, 2^19709144 is an apocalyptic number.

19709144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19709144 is an abundant number, since it is smaller than the sum of its proper divisors (25775176).

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

19709144 is a wasteful number, since it uses less digits than its factorization.

19709144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27099 (or 27095 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 19709144 is about 4439.4981698386. The cubic root of 19709144 is about 270.1194898640.

The spelling of 19709144 in words is "nineteen million, seven hundred nine thousand, one hundred forty-four".