821902040 has 32 divisors (see below), whose sum is σ = 1850625360. Its totient is φ = 328521600.

The previous prime is 821902013. The next prime is 821902051. The reversal of 821902040 is 40209128.

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 7 ways as a sum of consecutive naturals, for example, 54530 + ... + 67950.

Almost surely, 2^821902040 is an apocalyptic number.

It is an amenable number.

821902040 is an abundant number, since it is smaller than the sum of its proper divisors (1028723320).

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

821902040 is a wasteful number, since it uses less digits than its factorization.

821902040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14963 (or 14959 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 821902040 is about 28668.8339490814. The cubic root of 821902040 is about 936.7132989002.

The spelling of 821902040 in words is "eight hundred twenty-one million, nine hundred two thousand, forty".