900021765 has 8 divisors (see below), whose sum is σ = 1440034848. Its totient is φ = 480011600.

The previous prime is 900021761. The next prime is 900021767. The reversal of 900021765 is 567120009.

900021765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 900021765 - 2² = 900021761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900021761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30000711 + ... + 30000740.

It is an arithmetic number, because the mean of its divisors is an integer number (180004356).

Almost surely, 2^900021765 is an apocalyptic number.

It is an amenable number.

900021765 is a deficient number, since it is larger than the sum of its proper divisors (540013083).

900021765 is a wasteful number, since it uses less digits than its factorization.

900021765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60001459.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 900021765 is about 30000.3627478069. The cubic root of 900021765 is about 965.4971674601.

The spelling of 900021765 in words is "nine hundred million, twenty-one thousand, seven hundred sixty-five".