74436821 has 4 divisors (see below), whose sum is σ = 74532192. Its totient is φ = 74341452.

The previous prime is 74436787. The next prime is 74436871. The reversal of 74436821 is 12863447.

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: 12863447 = 653 ⋅19699.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74436821 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 (74436871) 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, 46505 + ... + 48078.

It is an arithmetic number, because the mean of its divisors is an integer number (18633048).

Almost surely, 2^74436821 is an apocalyptic number.

It is an amenable number.

74436821 is a deficient number, since it is larger than the sum of its proper divisors (95371).

74436821 is an equidigital number, since it uses as much as digits as its factorization.

74436821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95370.

The product of its digits is 32256, while the sum is 35.

The square root of 74436821 is about 8627.6776133558. The cubic root of 74436821 is about 420.6581160014.

It can be divided in two parts, 74436 and 821, that added together give a palindrome (75257).

The spelling of 74436821 in words is "seventy-four million, four hundred thirty-six thousand, eight hundred twenty-one".