7426421 has 2 divisors, whose sum is σ = 7426422. Its totient is φ = 7426420.

The previous prime is 7426411. The next prime is 7426451. The reversal of 7426421 is 1246247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4363921 + 3062500 = 2089^2 + 1750^2 .

It is an emirp because it is prime and its reverse (1246247) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7426421 - 2⁶ = 7426357 is a prime.

It is a Chen prime.

It is equal to p₅₀₃₆₃₉ and since 7426421 and 503639 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7426411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3713210 + 3713211.

It is an arithmetic number, because the mean of its divisors is an integer number (3713211).

Almost surely, 2^7426421 is an apocalyptic number.

It is an amenable number.

7426421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7426421 is an equidigital number, since it uses as much as digits as its factorization.

7426421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 26.

The square root of 7426421 is about 2725.1460511319. The cubic root of 7426421 is about 195.1011616241.

The spelling of 7426421 in words is "seven million, four hundred twenty-six thousand, four hundred twenty-one".