900877821 has 32 divisors (see below), whose sum is σ = 1305520128. Its totient is φ = 550368000.

The previous prime is 900877819. The next prime is 900877849. The reversal of 900877821 is 128778009.

It is not a de Polignac number, because 900877821 - 2¹ = 900877819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900877801) 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 31 ways as a sum of consecutive naturals, for example, 1199196 + ... + 1199946.

It is an arithmetic number, because the mean of its divisors is an integer number (40797504).

Almost surely, 2^900877821 is an apocalyptic number.

It is an amenable number.

900877821 is a deficient number, since it is larger than the sum of its proper divisors (404642307).

900877821 is a wasteful number, since it uses less digits than its factorization.

900877821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 900877821 is about 30014.6267842864. The cubic root of 900877821 is about 965.8031814424.

The spelling of 900877821 in words is "nine hundred million, eight hundred seventy-seven thousand, eight hundred twenty-one".