7744421 has 4 divisors (see below), whose sum is σ = 8011500. Its totient is φ = 7477344.

The previous prime is 7744409. The next prime is 7744423. The reversal of 7744421 is 1244477.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5452225 + 2292196 = 2335^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 7744421 - 2⁶ = 7744357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 267049 = 7744421 / (7 + 7 + 4 + 4 + 4 + 2 + 1).

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7744423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133496 + ... + 133553.

It is an arithmetic number, because the mean of its divisors is an integer number (2002875).

Almost surely, 2^7744421 is an apocalyptic number.

It is an amenable number.

7744421 is a deficient number, since it is larger than the sum of its proper divisors (267079).

7744421 is a wasteful number, since it uses less digits than its factorization.

7744421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267078.

The product of its digits is 6272, while the sum is 29.

The square root of 7744421 is about 2782.8799830392. The cubic root of 7744421 is about 197.8470828971.

Adding to 7744421 its reverse (1244477), we get a palindrome (8988898).

The spelling of 7744421 in words is "seven million, seven hundred forty-four thousand, four hundred twenty-one".