821927412 has 30 divisors (see below), whose sum is σ = 2148681458. Its totient is φ = 273975696.

The previous prime is 821927411. The next prime is 821927429. The reversal of 821927412 is 214729128.

821927412 is a `hidden beast` number, since 8 + 219 + 27 + 412 = 666.

It can be written as a sum of positive squares in only one way, i.e., 456505956 + 365421456 = 21366^2 + 19116^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821927411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1268083 + ... + 1268730.

Almost surely, 2^821927412 is an apocalyptic number.

It is an amenable number.

821927412 is an abundant number, since it is smaller than the sum of its proper divisors (1326754046).

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

821927412 is a wasteful number, since it uses less digits than its factorization.

821927412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536829 (or 2536818 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 821927412 is about 28669.2764470958. The cubic root of 821927412 is about 936.7229375368.

The spelling of 821927412 in words is "eight hundred twenty-one million, nine hundred twenty-seven thousand, four hundred twelve".