821463138 has 24 divisors (see below), whose sum is σ = 1873513200. Its totient is φ = 259409304.

The previous prime is 821463107. The next prime is 821463151. The reversal of 821463138 is 831364128.

821463138 is a `hidden beast` number, since 8 + 2 + 14 + 631 + 3 + 8 = 666.

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 11 ways as a sum of consecutive naturals, for example, 1200628 + ... + 1201311.

It is an arithmetic number, because the mean of its divisors is an integer number (78063050).

Almost surely, 2^821463138 is an apocalyptic number.

821463138 is an abundant number, since it is smaller than the sum of its proper divisors (1052050062).

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

821463138 is a wasteful number, since it uses less digits than its factorization.

821463138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401966 (or 2401963 counting only the distinct ones).

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

The square root of 821463138 is about 28661.1782381674. The cubic root of 821463138 is about 936.5465318471.

The spelling of 821463138 in words is "eight hundred twenty-one million, four hundred sixty-three thousand, one hundred thirty-eight".