74823821 has 2 divisors, whose sum is σ = 74823822. Its totient is φ = 74823820.

The previous prime is 74823809. The next prime is 74823841. The reversal of 74823821 is 12832847.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74476900 + 346921 = 8630^2 + 589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74823821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74823841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37411910 + 37411911.

It is an arithmetic number, because the mean of its divisors is an integer number (37411911).

Almost surely, 2^74823821 is an apocalyptic number.

It is an amenable number.

74823821 is a deficient number, since it is larger than the sum of its proper divisors (1).

74823821 is an equidigital number, since it uses as much as digits as its factorization.

74823821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 35.

The square root of 74823821 is about 8650.0763580445. The cubic root of 74823821 is about 421.3858623659.

The spelling of 74823821 in words is "seventy-four million, eight hundred twenty-three thousand, eight hundred twenty-one".