19700087449 has 9 divisors (see below), whose sum is σ = 22917571221. Its totient is φ = 16884947100.

The previous prime is 19700087447. The next prime is 19700087453. The reversal of 19700087449 is 94478000791.

The square root of 19700087449 is 140357.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 19700087449 - 2¹ = 19700087447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19700087447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 972474 + ... + 992524.

Almost surely, 2^19700087449 is an apocalyptic number.

19700087449 is the 140357-th square number.

19700087449 is the 70179-th centered octagonal number.

It is an amenable number.

19700087449 is a deficient number, since it is larger than the sum of its proper divisors (3217483772).

19700087449 is an frugal number, since it uses more digits than its factorization.

19700087449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40116 (or 20058 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 49.

Multiplying 19700087449 by its sum of digits (49), we get a square (965304285001 = 982499²).

19700087449 divided by its sum of digits (49) gives a square (402042601 = 20051²).

The spelling of 19700087449 in words is "nineteen billion, seven hundred million, eighty-seven thousand, four hundred forty-nine".