821934452 has 12 divisors (see below), whose sum is σ = 1514089920. Its totient is φ = 389337336.

The previous prime is 821934439. The next prime is 821934473. The reversal of 821934452 is 254439128.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5407388 + ... + 5407539.

It is an arithmetic number, because the mean of its divisors is an integer number (126174160).

Almost surely, 2^821934452 is an apocalyptic number.

It is an amenable number.

821934452 is a deficient number, since it is larger than the sum of its proper divisors (692155468).

821934452 is a wasteful number, since it uses less digits than its factorization.

821934452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10814950 (or 10814948 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 821934452 is about 28669.3992263528. The cubic root of 821934452 is about 936.7256119460.

The spelling of 821934452 in words is "eight hundred twenty-one million, nine hundred thirty-four thousand, four hundred fifty-two".