900043 has 4 divisors (see below), whose sum is σ = 903528. Its totient is φ = 896560.

The previous prime is 900037. The next prime is 900061. The reversal of 900043 is 340009.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 340009 = 23 ⋅14783.

It is a cyclic number.

It is not a de Polignac number, because 900043 - 2⁹ = 899531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (900143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1321 + ... + 1882.

It is an arithmetic number, because the mean of its divisors is an integer number (225882).

2⁹⁰⁰⁰⁴³ is an apocalyptic number.

900043 is a deficient number, since it is larger than the sum of its proper divisors (3485).

900043 is a wasteful number, since it uses less digits than its factorization.

900043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3484.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 900043 is about 948.7059607697. The cubic root of 900043 is about 96.5504760673.

The spelling of 900043 in words is "nine hundred thousand, forty-three".