7225440 has 48 divisors (see below), whose sum is σ = 22761648. Its totient is φ = 1926656.

The previous prime is 7225429. The next prime is 7225441. The reversal of 7225440 is 445227.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 7225440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7225441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7047 + ... + 8006.

It is an arithmetic number, because the mean of its divisors is an integer number (474201).

Almost surely, 2^7225440 is an apocalyptic number.

It is an amenable number.

7225440 is an abundant number, since it is smaller than the sum of its proper divisors (15536208).

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

7225440 is a wasteful number, since it uses less digits than its factorization.

7225440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15071 (or 15063 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 7225440 is about 2688.0178570835. The cubic root of 7225440 is about 193.3250359763.

The spelling of 7225440 in words is "seven million, two hundred twenty-five thousand, four hundred forty".