74134821 has 4 divisors (see below), whose sum is σ = 98846432. Its totient is φ = 49423212.

The previous prime is 74134813. The next prime is 74134829. The reversal of 74134821 is 12843147.

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: 12843147 = 3 ⋅4281049.

It is an interprime number because it is at equal distance from previous prime (74134813) and next prime (74134829).

It is not a de Polignac number, because 74134821 - 2³ = 74134813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74134829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12355801 + ... + 12355806.

It is an arithmetic number, because the mean of its divisors is an integer number (24711608).

Almost surely, 2^74134821 is an apocalyptic number.

It is an amenable number.

74134821 is a deficient number, since it is larger than the sum of its proper divisors (24711611).

74134821 is a wasteful number, since it uses less digits than its factorization.

74134821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24711610.

The product of its digits is 5376, while the sum is 30.

The square root of 74134821 is about 8610.1580124873. The cubic root of 74134821 is about 420.0884564255.

Adding to 74134821 its reverse (12843147), we get a palindrome (86977968).

The spelling of 74134821 in words is "seventy-four million, one hundred thirty-four thousand, eight hundred twenty-one".