74857 has 2 divisors, whose sum is σ = 74858. Its totient is φ = 74856.

The previous prime is 74843. The next prime is 74861. The reversal of 74857 is 75847.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47961 + 26896 = 219^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 74857 - 2⁷ = 74729 is a prime.

It is a Chen prime.

74857 is a lucky number.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (74827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37428 + 37429.

It is an arithmetic number, because the mean of its divisors is an integer number (37429).

2⁷⁴⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

74857 is a deficient number, since it is larger than the sum of its proper divisors (1).

74857 is an equidigital number, since it uses as much as digits as its factorization.

74857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7840, while the sum is 31.

The square root of 74857 is about 273.6000730994. The cubic root of 74857 is about 42.1448137968.

Subtracting 74857 from its reverse (75847), we obtain a triangular number (990 = T₄₄).

The spelling of 74857 in words is "seventy-four thousand, eight hundred fifty-seven".