7423840 has 24 divisors (see below), whose sum is σ = 17539200. Its totient is φ = 2969472.

The previous prime is 7423807. The next prime is 7423841. The reversal of 7423840 is 483247.

It is a super-2 number, since 2×7423840² = 110226800691200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7423799 and 7423808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7423841) 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, 23040 + ... + 23359.

It is an arithmetic number, because the mean of its divisors is an integer number (730800).

Almost surely, 2^7423840 is an apocalyptic number.

It is an amenable number.

7423840 is an abundant number, since it is smaller than the sum of its proper divisors (10115360).

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

7423840 is a wasteful number, since it uses less digits than its factorization.

7423840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46414 (or 46406 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 7423840 is about 2724.6724573791. The cubic root of 7423840 is about 195.0785569964.

The spelling of 7423840 in words is "seven million, four hundred twenty-three thousand, eight hundred forty".