19400478992 has 20 divisors (see below), whose sum is σ = 37694921820. Its totient is φ = 9672757248.

The previous prime is 19400478973. The next prime is 19400478997. The reversal of 19400478992 is 29987400491.

It can be written as a sum of positive squares in 2 ways, for example, as 3869337616 + 15531141376 = 62204^2 + 124624^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19400478997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1711817 + ... + 1723112.

It is an arithmetic number, because the mean of its divisors is an integer number (1884746091).

Almost surely, 2^19400478992 is an apocalyptic number.

It is an amenable number.

19400478992 is a deficient number, since it is larger than the sum of its proper divisors (18294442828).

19400478992 is a wasteful number, since it uses less digits than its factorization.

19400478992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3435290 (or 3435284 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 19400478992 in words is "nineteen billion, four hundred million, four hundred seventy-eight thousand, nine hundred ninety-two".