7421661 has 24 divisors (see below), whose sum is σ = 11637080. Its totient is φ = 4530816.

The previous prime is 7421641. The next prime is 7421677. The reversal of 7421661 is 1661247.

It can be written as a sum of positive squares in 4 ways, for example, as 562500 + 6859161 = 750^2 + 2619^2 .

It is not a de Polignac number, because 7421661 - 2¹⁵ = 7388893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7421641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26655 + ... + 26931.

Almost surely, 2^7421661 is an apocalyptic number.

It is an amenable number.

7421661 is a deficient number, since it is larger than the sum of its proper divisors (4215419).

7421661 is a wasteful number, since it uses less digits than its factorization.

7421661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525 (or 522 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 7421661 is about 2724.2725634562. The cubic root of 7421661 is about 195.0594690414.

The spelling of 7421661 in words is "seven million, four hundred twenty-one thousand, six hundred sixty-one".