7445556 has 18 divisors (see below), whose sum is σ = 18820802. Its totient is φ = 2481840.

The previous prime is 7445551. The next prime is 7445569. The reversal of 7445556 is 6555447.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6200100 + 1245456 = 2490^2 + 1116^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 206821 = 7445556 / (7 + 4 + 4 + 5 + 5 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 7445556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7445551) 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 5 ways as a sum of consecutive naturals, for example, 103375 + ... + 103446.

Almost surely, 2^7445556 is an apocalyptic number.

It is an amenable number.

7445556 is an abundant number, since it is smaller than the sum of its proper divisors (11375246).

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

7445556 is a wasteful number, since it uses less digits than its factorization.

7445556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206831 (or 206826 counting only the distinct ones).

The product of its digits is 84000, while the sum is 36.

The square root of 7445556 is about 2728.6546135413. The cubic root of 7445556 is about 195.2685845286.

It can be divided in two parts, 7445 and 556, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 7445556 in words is "seven million, four hundred forty-five thousand, five hundred fifty-six".