7445421 has 6 divisors (see below), whose sum is σ = 10754510. Its totient is φ = 4963608.

The previous prime is 7445393. The next prime is 7445437. The reversal of 7445421 is 1245447.

It can be written as a sum of positive squares in only one way, i.e., 7209225 + 236196 = 2685^2 + 486^2 .

It is not a de Polignac number, because 7445421 - 2⁷ = 7445293 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7445441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 413626 + ... + 413643.

Almost surely, 2^7445421 is an apocalyptic number.

It is an amenable number.

7445421 is a deficient number, since it is larger than the sum of its proper divisors (3309089).

7445421 is a wasteful number, since it uses less digits than its factorization.

7445421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827275 (or 827272 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 7445421 is about 2728.6298759634. The cubic root of 7445421 is about 195.2674043428.

The spelling of 7445421 in words is "seven million, four hundred forty-five thousand, four hundred twenty-one".