7440427 has 2 divisors, whose sum is σ = 7440428. Its totient is φ = 7440426.

The previous prime is 7440421. The next prime is 7440437. The reversal of 7440427 is 7240447.

It is a weak prime.

It is an emirp because it is prime and its reverse (7240447) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7440427 is a prime.

7440427 is a lucky number.

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 7440395 and 7440404.

It is not a weakly prime, because it can be changed into another prime (7440421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3720213 + 3720214.

It is an arithmetic number, because the mean of its divisors is an integer number (3720214).

Almost surely, 2^7440427 is an apocalyptic number.

7440427 is a deficient number, since it is larger than the sum of its proper divisors (1).

7440427 is an equidigital number, since it uses as much as digits as its factorization.

7440427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 28.

The square root of 7440427 is about 2727.7146111718. The cubic root of 7440427 is about 195.2237361818.

The spelling of 7440427 in words is "seven million, four hundred forty thousand, four hundred twenty-seven".