19204887394 has 32 divisors (see below), whose sum is σ = 36524390400. Its totient is φ = 7355599440.

The previous prime is 19204887329. The next prime is 19204887421. The reversal of 19204887394 is 49378840291.

It is a super-4 number, since 4×19204887394⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1047754 + ... + 1065925.

It is an arithmetic number, because the mean of its divisors is an integer number (1141387200).

Almost surely, 2^19204887394 is an apocalyptic number.

19204887394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19204887394 is a deficient number, since it is larger than the sum of its proper divisors (17319503006).

19204887394 is a wasteful number, since it uses less digits than its factorization.

19204887394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113758.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 19204887394 in words is "nineteen billion, two hundred four million, eight hundred eighty-seven thousand, three hundred ninety-four".