74109721 has 8 divisors (see below), whose sum is σ = 84839040. Its totient is φ = 63415968.

The previous prime is 74109701. The next prime is 74109727. The reversal of 74109721 is 12790147.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 74109721 - 2⁵ = 74109689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74109727) 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 7 ways as a sum of consecutive naturals, for example, 4261 + ... + 12898.

It is an arithmetic number, because the mean of its divisors is an integer number (10604880).

Almost surely, 2^74109721 is an apocalyptic number.

It is an amenable number.

74109721 is a deficient number, since it is larger than the sum of its proper divisors (10729319).

74109721 is a wasteful number, since it uses less digits than its factorization.

74109721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17783.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 74109721 is about 8608.7003084089. The cubic root of 74109721 is about 420.0410409630.

Adding to 74109721 its reverse (12790147), we get a palindrome (86899868).

The spelling of 74109721 in words is "seventy-four million, one hundred nine thousand, seven hundred twenty-one".