74121779 has 4 divisors (see below), whose sum is σ = 74855760. Its totient is φ = 73387800.

The previous prime is 74121757. The next prime is 74121811. The reversal of 74121779 is 97712147.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74121779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74121079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366839 + ... + 367040.

It is an arithmetic number, because the mean of its divisors is an integer number (18713940).

Almost surely, 2^74121779 is an apocalyptic number.

74121779 is a deficient number, since it is larger than the sum of its proper divisors (733981).

74121779 is a wasteful number, since it uses less digits than its factorization.

74121779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733980.

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

The square root of 74121779 is about 8609.4006179292. The cubic root of 74121779 is about 420.0638206116.

The spelling of 74121779 in words is "seventy-four million, one hundred twenty-one thousand, seven hundred seventy-nine".