74243657 has 2 divisors, whose sum is σ = 74243658. Its totient is φ = 74243656.

The previous prime is 74243633. The next prime is 74243669. The reversal of 74243657 is 75634247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72658576 + 1585081 = 8524^2 + 1259^2 .

It is a cyclic number.

It is not a de Polignac number, because 74243657 - 2⁶ = 74243593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74243657.

It is not a weakly prime, because it can be changed into another prime (74243627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37121828 + 37121829.

It is an arithmetic number, because the mean of its divisors is an integer number (37121829).

Almost surely, 2^74243657 is an apocalyptic number.

It is an amenable number.

74243657 is a deficient number, since it is larger than the sum of its proper divisors (1).

74243657 is an equidigital number, since it uses as much as digits as its factorization.

74243657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 38.

The square root of 74243657 is about 8616.4759037555. The cubic root of 74243657 is about 420.2939306814.

The spelling of 74243657 in words is "seventy-four million, two hundred forty-three thousand, six hundred fifty-seven".