74429921 has 4 divisors (see below), whose sum is σ = 76996500. Its totient is φ = 71863344.

The previous prime is 74429917. The next prime is 74429923. The reversal of 74429921 is 12992447.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58140625 + 16289296 = 7625^2 + 4036^2 .

It is a cyclic number.

It is not a de Polignac number, because 74429921 - 2² = 74429917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74429923) 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, 1283246 + ... + 1283303.

It is an arithmetic number, because the mean of its divisors is an integer number (19249125).

Almost surely, 2^74429921 is an apocalyptic number.

It is an amenable number.

74429921 is a deficient number, since it is larger than the sum of its proper divisors (2566579).

74429921 is a wasteful number, since it uses less digits than its factorization.

74429921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566578.

The product of its digits is 36288, while the sum is 38.

The square root of 74429921 is about 8627.2777282292. The cubic root of 74429921 is about 420.6451178165.

The spelling of 74429921 in words is "seventy-four million, four hundred twenty-nine thousand, nine hundred twenty-one".