74120905 has 8 divisors (see below), whose sum is σ = 88994952. Its totient is φ = 59263488.

The previous prime is 74120903. The next prime is 74120923. The reversal of 74120905 is 50902147.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12089529 + 62031376 = 3477^2 + 7876^2 .

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 74120905 - 2¹ = 74120903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74120903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10107 + ... + 15823.

It is an arithmetic number, because the mean of its divisors is an integer number (11124369).

Almost surely, 2^74120905 is an apocalyptic number.

It is an amenable number.

74120905 is a deficient number, since it is larger than the sum of its proper divisors (14874047).

74120905 is a wasteful number, since it uses less digits than its factorization.

74120905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8315.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 74120905 is about 8609.3498593099. The cubic root of 74120905 is about 420.0621695574.

The spelling of 74120905 in words is "seventy-four million, one hundred twenty thousand, nine hundred five".