19400982478 has 8 divisors (see below), whose sum is σ = 29109077568. Its totient is φ = 9697956624.

The previous prime is 19400982409. The next prime is 19400982481. The reversal of 19400982478 is 87428900491.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×19400982478² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 1257726 + ... + 1273057.

It is an arithmetic number, because the mean of its divisors is an integer number (3638634696).

Almost surely, 2^19400982478 is an apocalyptic number.

19400982478 is a deficient number, since it is larger than the sum of its proper divisors (9708095090).

19400982478 is a wasteful number, since it uses less digits than its factorization.

19400982478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2534618.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 19400982478 in words is "nineteen billion, four hundred million, nine hundred eighty-two thousand, four hundred seventy-eight".