74177921 has 4 divisors (see below), whose sum is σ = 77403072. Its totient is φ = 70952772.

The previous prime is 74177869. The next prime is 74177923. The reversal of 74177921 is 12977147.

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.

It is a cyclic number.

It is not a de Polignac number, because 74177921 - 2¹⁴ = 74161537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74177923) 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, 1612541 + ... + 1612586.

It is an arithmetic number, because the mean of its divisors is an integer number (19350768).

Almost surely, 2^74177921 is an apocalyptic number.

It is an amenable number.

74177921 is a deficient number, since it is larger than the sum of its proper divisors (3225151).

74177921 is a wasteful number, since it uses less digits than its factorization.

74177921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3225150.

The product of its digits is 24696, while the sum is 38.

The square root of 74177921 is about 8612.6605064869. The cubic root of 74177921 is about 420.1698500478.

The spelling of 74177921 in words is "seventy-four million, one hundred seventy-seven thousand, nine hundred twenty-one".