7438621 has 2 divisors, whose sum is σ = 7438622. Its totient is φ = 7438620.

The previous prime is 7438619. The next prime is 7438631. The reversal of 7438621 is 1268347.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7425625 + 12996 = 2725^2 + 114^2 .

It is a cyclic number.

It is not a de Polignac number, because 7438621 - 2¹ = 7438619 is a prime.

Together with 7438619, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 7⁸ + 4³ + 3¹³ + 8 + 6⁶ + 2¹⁵ + 1 .

7438621 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7438631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3719310 + 3719311.

It is an arithmetic number, because the mean of its divisors is an integer number (3719311).

Almost surely, 2^7438621 is an apocalyptic number.

It is an amenable number.

7438621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7438621 is an equidigital number, since it uses as much as digits as its factorization.

7438621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 7438621 is about 2727.3835447183. The cubic root of 7438621 is about 195.2079394810.

The spelling of 7438621 in words is "seven million, four hundred thirty-eight thousand, six hundred twenty-one".