74187649 has 2 divisors, whose sum is σ = 74187650. Its totient is φ = 74187648.

The previous prime is 74187629. The next prime is 74187661. The reversal of 74187649 is 94678147.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71707024 + 2480625 = 8468^2 + 1575^2 .

It is an emirp because it is prime and its reverse (94678147) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74187649 - 2⁹ = 74187137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 74187599 and 74187608.

It is not a weakly prime, because it can be changed into another prime (74187629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37093824 + 37093825.

It is an arithmetic number, because the mean of its divisors is an integer number (37093825).

Almost surely, 2^74187649 is an apocalyptic number.

It is an amenable number.

74187649 is a deficient number, since it is larger than the sum of its proper divisors (1).

74187649 is an equidigital number, since it uses as much as digits as its factorization.

74187649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The square root of 74187649 is about 8613.2252379698. The cubic root of 74187649 is about 420.1882168501.

The spelling of 74187649 in words is "seventy-four million, one hundred eighty-seven thousand, six hundred forty-nine".