7443661 has 4 divisors (see below), whose sum is σ = 7450300. Its totient is φ = 7437024.

The previous prime is 7443643. The next prime is 7443679. The reversal of 7443661 is 1663447.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1663447 = 179 ⋅9293.

It is an interprime number because it is at equal distance from previous prime (7443643) and next prime (7443679).

It can be written as a sum of positive squares in 2 ways, for example, as 4182025 + 3261636 = 2045^2 + 1806^2 .

It is a cyclic number.

It is not a de Polignac number, because 7443661 - 2⁵ = 7443629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7483661) 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, 1176 + ... + 4033.

It is an arithmetic number, because the mean of its divisors is an integer number (1862575).

Almost surely, 2^7443661 is an apocalyptic number.

It is an amenable number.

7443661 is a deficient number, since it is larger than the sum of its proper divisors (6639).

7443661 is a wasteful number, since it uses less digits than its factorization.

7443661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6638.

The product of its digits is 12096, while the sum is 31.

The square root of 7443661 is about 2728.3073507213. The cubic root of 7443661 is about 195.2520169114.

The spelling of 7443661 in words is "seven million, four hundred forty-three thousand, six hundred sixty-one".