75420439 has 2 divisors, whose sum is σ = 75420440. Its totient is φ = 75420438.

The previous prime is 75420421. The next prime is 75420491. The reversal of 75420439 is 93402457.

It is a weak prime.

It is an emirp because it is prime and its reverse (93402457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75420439 - 2⁵ = 75420407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75420239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37710219 + 37710220.

It is an arithmetic number, because the mean of its divisors is an integer number (37710220).

Almost surely, 2^75420439 is an apocalyptic number.

75420439 is a deficient number, since it is larger than the sum of its proper divisors (1).

75420439 is an equidigital number, since it uses as much as digits as its factorization.

75420439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 75420439 is about 8684.4941706469. The cubic root of 75420439 is about 422.5028913356.

The spelling of 75420439 in words is "seventy-five million, four hundred twenty thousand, four hundred thirty-nine".