900021543 has 8 divisors (see below), whose sum is σ = 1238739456. Its totient is φ = 580659000.

The previous prime is 900021517. The next prime is 900021553. The reversal of 900021543 is 345120009.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 900021543 - 2²⁰ = 898972967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900021553) by changing a digit.

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, 4838733 + ... + 4838918.

It is an arithmetic number, because the mean of its divisors is an integer number (154842432).

Almost surely, 2^900021543 is an apocalyptic number.

900021543 is a gapful number since it is divisible by the number (93) formed by its first and last digit.

900021543 is a deficient number, since it is larger than the sum of its proper divisors (338717913).

900021543 is a wasteful number, since it uses less digits than its factorization.

900021543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9677685.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 900021543 is about 30000.3590478514. The cubic root of 900021543 is about 965.4970880767.

The spelling of 900021543 in words is "nine hundred million, twenty-one thousand, five hundred forty-three".