74837993 has 2 divisors, whose sum is σ = 74837994. Its totient is φ = 74837992.

The previous prime is 74837957. The next prime is 74838007. The reversal of 74837993 is 39973847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72726784 + 2111209 = 8528^2 + 1453^2 .

It is an emirp because it is prime and its reverse (39973847) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74837993 - 2¹⁰ = 74836969 is a prime.

It is not a weakly prime, because it can be changed into another prime (74837923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37418996 + 37418997.

It is an arithmetic number, because the mean of its divisors is an integer number (37418997).

Almost surely, 2^74837993 is an apocalyptic number.

It is an amenable number.

74837993 is a deficient number, since it is larger than the sum of its proper divisors (1).

74837993 is an equidigital number, since it uses as much as digits as its factorization.

74837993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 50.

The square root of 74837993 is about 8650.8955027789. The cubic root of 74837993 is about 421.4124648719.

The spelling of 74837993 in words is "seventy-four million, eight hundred thirty-seven thousand, nine hundred ninety-three".