940821 has 16 divisors (see below), whose sum is σ = 1456128. Its totient is φ = 529200.

The previous prime is 940817. The next prime is 940829. The reversal of 940821 is 128049.

940821 = T₁₂₆ + T₁₂₇ + ... + T₁₉₆.

It is not a de Polignac number, because 940821 - 2² = 940817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 940791 and 940800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (940829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1176 + ... + 1806.

It is an arithmetic number, because the mean of its divisors is an integer number (91008).

2⁹⁴⁰⁸²¹ is an apocalyptic number.

It is an amenable number.

940821 is a deficient number, since it is larger than the sum of its proper divisors (515307).

940821 is a wasteful number, since it uses less digits than its factorization.

940821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 940821 is about 969.9592774957. The cubic root of 940821 is about 97.9871217285.

The spelling of 940821 in words is "nine hundred forty thousand, eight hundred twenty-one".