19400478972 has 24 divisors (see below), whose sum is σ = 51734610816. Its totient is φ = 5542993968.

The previous prime is 19400478971. The next prime is 19400478973. The reversal of 19400478972 is 27987400491.

It is an interprime number because it is at equal distance from previous prime (19400478971) and next prime (19400478973).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19400478971) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 115478958 + ... + 115479125.

It is an arithmetic number, because the mean of its divisors is an integer number (2155608784).

Almost surely, 2^19400478972 is an apocalyptic number.

19400478972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19400478972 is an abundant number, since it is smaller than the sum of its proper divisors (32334131844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19400478972 is a wasteful number, since it uses less digits than its factorization.

19400478972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230958097 (or 230958095 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 51.

The spelling of 19400478972 in words is "nineteen billion, four hundred million, four hundred seventy-eight thousand, nine hundred seventy-two".