940280021 has 4 divisors (see below), whose sum is σ = 972703500. Its totient is φ = 907856544.

The previous prime is 940280017. The next prime is 940280023. The reversal of 940280021 is 120082049.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120082049 = 113 ⋅1062673.

It can be written as a sum of positive squares in 2 ways, for example, as 242580625 + 697699396 = 15575^2 + 26414^2 .

It is a cyclic number.

It is not a de Polignac number, because 940280021 - 2² = 940280017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (940280023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16211696 + ... + 16211753.

It is an arithmetic number, because the mean of its divisors is an integer number (243175875).

Almost surely, 2^940280021 is an apocalyptic number.

It is an amenable number.

940280021 is a deficient number, since it is larger than the sum of its proper divisors (32423479).

940280021 is a wasteful number, since it uses less digits than its factorization.

940280021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32423478.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 940280021 is about 30663.9857324517. The cubic root of 940280021 is about 979.6833702220.

The spelling of 940280021 in words is "nine hundred forty million, two hundred eighty thousand, twenty-one".