74198639 has 2 divisors, whose sum is σ = 74198640. Its totient is φ = 74198638.

The previous prime is 74198633. The next prime is 74198651. The reversal of 74198639 is 93689147.

It is a weak prime.

It is an emirp because it is prime and its reverse (93689147) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74198639 - 2⁴ = 74198623 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 74198593 and 74198602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74198633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37099319 + 37099320.

It is an arithmetic number, because the mean of its divisors is an integer number (37099320).

Almost surely, 2^74198639 is an apocalyptic number.

74198639 is a deficient number, since it is larger than the sum of its proper divisors (1).

74198639 is an equidigital number, since it uses as much as digits as its factorization.

74198639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 74198639 is about 8613.8631867473. The cubic root of 74198639 is about 420.2089644209.

The spelling of 74198639 in words is "seventy-four million, one hundred ninety-eight thousand, six hundred thirty-nine".