18398401488 has 30 divisors (see below), whose sum is σ = 51489971234. Its totient is φ = 6132800448.

The previous prime is 18398401457. The next prime is 18398401507. The reversal of 18398401488 is 88410489381.

18398401488 is a `hidden beast` number, since 1 + 83 + 9 + 84 + 0 + 1 + 488 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18195851664 + 202549824 = 134892^2 + 14232^2 .

It is a super-2 number, since 2×18398401488² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 63883195 + ... + 63883482.

Almost surely, 2^18398401488 is an apocalyptic number.

18398401488 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18398401488 is an abundant number, since it is smaller than the sum of its proper divisors (33091569746).

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

18398401488 is a wasteful number, since it uses less digits than its factorization.

18398401488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127766691 (or 127766682 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 54.

The spelling of 18398401488 in words is "eighteen billion, three hundred ninety-eight million, four hundred one thousand, four hundred eighty-eight".