19785402229 has 4 divisors (see below), whose sum is σ = 19787339584. Its totient is φ = 19783464876.

The previous prime is 19785402209. The next prime is 19785402283. The reversal of 19785402229 is 92220458791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92220458791 = 421 ⋅219050971.

It is a cyclic number.

It is not a de Polignac number, because 19785402229 - 2¹³ = 19785394037 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 (19785402209) 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 3 ways as a sum of consecutive naturals, for example, 953277 + ... + 973810.

It is an arithmetic number, because the mean of its divisors is an integer number (4946834896).

Almost surely, 2^19785402229 is an apocalyptic number.

It is an amenable number.

19785402229 is a deficient number, since it is larger than the sum of its proper divisors (1937355).

19785402229 is a wasteful number, since it uses less digits than its factorization.

19785402229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937354.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 19785402229 in words is "nineteen billion, seven hundred eighty-five million, four hundred two thousand, two hundred twenty-nine".