163281438 has 24 divisors (see below), whose sum is σ = 359775000. Its totient is φ = 53504304.

The previous prime is 163281427. The next prime is 163281463. The reversal of 163281438 is 834182361.

163281438 is a `hidden beast` number, since 1 + 632 + 8 + 14 + 3 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 75813 + ... + 77936.

It is an arithmetic number, because the mean of its divisors is an integer number (14990625).

Almost surely, 2^163281438 is an apocalyptic number.

163281438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

163281438 is an abundant number, since it is smaller than the sum of its proper divisors (196493562).

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

163281438 is a wasteful number, since it uses less digits than its factorization.

163281438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153816 (or 153813 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 163281438 is about 12778.1625439654. The cubic root of 163281438 is about 546.5697670970.

It can be divided in two parts, 16328 and 1438, that added together give a triangular number (17766 = T₁₈₈).

The spelling of 163281438 in words is "one hundred sixty-three million, two hundred eighty-one thousand, four hundred thirty-eight".