74172309 has 32 divisors (see below), whose sum is σ = 112285440. Its totient is φ = 43287552.

The previous prime is 74172299. The next prime is 74172313. The reversal of 74172309 is 90327147.

It is not a de Polignac number, because 74172309 - 2⁵ = 74172277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74172309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74172359) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42547 + ... + 44255.

It is an arithmetic number, because the mean of its divisors is an integer number (3508920).

Almost surely, 2^74172309 is an apocalyptic number.

It is an amenable number.

74172309 is a deficient number, since it is larger than the sum of its proper divisors (38113131).

74172309 is a wasteful number, since it uses less digits than its factorization.

74172309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 74172309 is about 8612.3347008811. The cubic root of 74172309 is about 420.1592536663.

The spelling of 74172309 in words is "seventy-four million, one hundred seventy-two thousand, three hundred nine".