19509794290 has 16 divisors (see below), whose sum is σ = 40134434112. Its totient is φ = 6689072304.

The previous prime is 19509794279. The next prime is 19509794299. The reversal of 19509794290 is 9249790591.

It is not an unprimeable number, because it can be changed into a prime (19509794299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139355604 + ... + 139355743.

It is an arithmetic number, because the mean of its divisors is an integer number (2508402132).

Almost surely, 2^19509794290 is an apocalyptic number.

19509794290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19509794290 is an abundant number, since it is smaller than the sum of its proper divisors (20624639822).

19509794290 is a wasteful number, since it uses less digits than its factorization.

19509794290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278711361.

The product of its (nonzero) digits is 1837080, while the sum is 55.

The spelling of 19509794290 in words is "nineteen billion, five hundred nine million, seven hundred ninety-four thousand, two hundred ninety".