19739149 has 4 divisors (see below), whose sum is σ = 19756636. Its totient is φ = 19721664.

The previous prime is 19739141. The next prime is 19739189. The reversal of 19739149 is 94193791.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10017225 + 9721924 = 3165^2 + 3118^2 .

It is a cyclic number.

It is not a de Polignac number, because 19739149 - 2³ = 19739141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19739141) 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, 6924 + ... + 9349.

It is an arithmetic number, because the mean of its divisors is an integer number (4939159).

Almost surely, 2^19739149 is an apocalyptic number.

It is an amenable number.

19739149 is a deficient number, since it is larger than the sum of its proper divisors (17487).

19739149 is a wasteful number, since it uses less digits than its factorization.

19739149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17486.

The product of its digits is 61236, while the sum is 43.

The square root of 19739149 is about 4442.8762080436. The cubic root of 19739149 is about 270.2564960815.

The spelling of 19739149 in words is "nineteen million, seven hundred thirty-nine thousand, one hundred forty-nine".