74438421 has 4 divisors (see below), whose sum is σ = 99251232. Its totient is φ = 49625612.

The previous prime is 74438417. The next prime is 74438423. The reversal of 74438421 is 12483447.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12483447 = 3 ⋅4161149.

It is a cyclic number.

It is not a de Polignac number, because 74438421 - 2² = 74438417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74438423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12406401 + ... + 12406406.

It is an arithmetic number, because the mean of its divisors is an integer number (24812808).

Almost surely, 2^74438421 is an apocalyptic number.

It is an amenable number.

74438421 is a deficient number, since it is larger than the sum of its proper divisors (24812811).

74438421 is a wasteful number, since it uses less digits than its factorization.

74438421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24812810.

The product of its digits is 21504, while the sum is 33.

The square root of 74438421 is about 8627.7703376944. The cubic root of 74438421 is about 420.6611299586.

The spelling of 74438421 in words is "seventy-four million, four hundred thirty-eight thousand, four hundred twenty-one".