7023440 has 20 divisors (see below), whose sum is σ = 16329684. Its totient is φ = 2809344.

The previous prime is 7023433. The next prime is 7023461. The reversal of 7023440 is 443207.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 753424 + 6270016 = 868^2 + 2504^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 43817 + ... + 43976.

Almost surely, 2^7023440 is an apocalyptic number.

It is an amenable number.

7023440 is an abundant number, since it is smaller than the sum of its proper divisors (9306244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7023440 is a wasteful number, since it uses less digits than its factorization.

7023440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87806 (or 87800 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 7023440 is about 2650.1773525559. The cubic root of 7023440 is about 191.5063999479.

Adding to 7023440 its reverse (443207), we get a palindrome (7466647).

The spelling of 7023440 in words is "seven million, twenty-three thousand, four hundred forty".