74001621 has 8 divisors (see below), whose sum is σ = 100530720. Its totient is φ = 48403472.

The previous prime is 74001617. The next prime is 74001623. The reversal of 74001621 is 12610047.

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

It is a cyclic number.

It is not a de Polignac number, because 74001621 - 2² = 74001617 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74001623) 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, 232551 + ... + 232868.

It is an arithmetic number, because the mean of its divisors is an integer number (12566340).

Almost surely, 2^74001621 is an apocalyptic number.

It is an amenable number.

74001621 is a deficient number, since it is larger than the sum of its proper divisors (26529099).

74001621 is a wasteful number, since it uses less digits than its factorization.

74001621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465475.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 74001621 is about 8602.4194852379. The cubic root of 74001621 is about 419.8367109005.

Adding to 74001621 its reverse (12610047), we get a palindrome (86611668).

The spelling of 74001621 in words is "seventy-four million, one thousand, six hundred twenty-one".