18871493470 has 16 divisors (see below), whose sum is σ = 34305013728. Its totient is φ = 7473858400.

The previous prime is 18871493447. The next prime is 18871493477. The reversal of 18871493470 is 7439417881.

It is a super-2 number, since 2×18871493470² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18871493477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9341314 + ... + 9343333.

It is an arithmetic number, because the mean of its divisors is an integer number (2144063358).

Almost surely, 2^18871493470 is an apocalyptic number.

18871493470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18871493470 is a deficient number, since it is larger than the sum of its proper divisors (15433520258).

18871493470 is a wasteful number, since it uses less digits than its factorization.

18871493470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18684755.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 18871493470 in words is "eighteen billion, eight hundred seventy-one million, four hundred ninety-three thousand, four hundred seventy".