19867458440 has 32 divisors (see below), whose sum is σ = 45434603160. Its totient is φ = 7816704000.

The previous prime is 19867458353. The next prime is 19867458451. The reversal of 19867458440 is 4485476891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16428574276 + 3438884164 = 128174^2 + 58642^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4068761 + ... + 4073640.

Almost surely, 2^19867458440 is an apocalyptic number.

19867458440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19867458440 is an abundant number, since it is smaller than the sum of its proper divisors (25567144720).

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

19867458440 is a wasteful number, since it uses less digits than its factorization.

19867458440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8142473 (or 8142469 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 56.

The spelling of 19867458440 in words is "nineteen billion, eight hundred sixty-seven million, four hundred fifty-eight thousand, four hundred forty".