74942039 has 2 divisors, whose sum is σ = 74942040. Its totient is φ = 74942038.

The previous prime is 74942029. The next prime is 74942047. The reversal of 74942039 is 93024947.

It is a strong prime.

It is an emirp because it is prime and its reverse (93024947) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74942039 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 74941993 and 74942011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74942029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37471019 + 37471020.

It is an arithmetic number, because the mean of its divisors is an integer number (37471020).

Almost surely, 2^74942039 is an apocalyptic number.

74942039 is a deficient number, since it is larger than the sum of its proper divisors (1).

74942039 is an equidigital number, since it uses as much as digits as its factorization.

74942039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 74942039 is about 8656.9070111674. The cubic root of 74942039 is about 421.6076686522.

The spelling of 74942039 in words is "seventy-four million, nine hundred forty-two thousand, thirty-nine".