74245139 has 2 divisors, whose sum is σ = 74245140. Its totient is φ = 74245138.

The previous prime is 74245123. The next prime is 74245147. The reversal of 74245139 is 93154247.

It is a strong prime.

It is an emirp because it is prime and its reverse (93154247) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74245139 - 2⁴ = 74245123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 74245099 and 74245108.

It is not a weakly prime, because it can be changed into another prime (74245189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37122569 + 37122570.

It is an arithmetic number, because the mean of its divisors is an integer number (37122570).

Almost surely, 2^74245139 is an apocalyptic number.

74245139 is a deficient number, since it is larger than the sum of its proper divisors (1).

74245139 is an equidigital number, since it uses as much as digits as its factorization.

74245139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 74245139 is about 8616.5619013618. The cubic root of 74245139 is about 420.2967272007.

The spelling of 74245139 in words is "seventy-four million, two hundred forty-five thousand, one hundred thirty-nine".