19709429 has 6 divisors (see below), whose sum is σ = 19956726. Its totient is φ = 19465160.

The previous prime is 19709423. The next prime is 19709449. The reversal of 19709429 is 92490791.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17222500 + 2486929 = 4150^2 + 1577^2 .

It is not a de Polignac number, because 19709429 - 2¹² = 19705333 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 (19709423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5459 + ... + 8319.

It is an arithmetic number, because the mean of its divisors is an integer number (3326121).

Almost surely, 2^19709429 is an apocalyptic number.

It is an amenable number.

19709429 is a deficient number, since it is larger than the sum of its proper divisors (247297).

19709429 is an frugal number, since it uses more digits than its factorization.

19709429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027 (or 2944 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 19709429 is about 4439.5302679450. The cubic root of 19709429 is about 270.1207918600.

The spelling of 19709429 in words is "nineteen million, seven hundred nine thousand, four hundred twenty-nine".