172388403385 has 16 divisors (see below), whose sum is σ = 225688462272. Its totient is φ = 125364289600.

The previous prime is 172388403337. The next prime is 172388403401. The reversal of 172388403385 is 583304883271.

It is not a de Polignac number, because 172388403385 - 2¹⁷ = 172388272313 is a prime.

It is a super-4 number, since 4×172388403385⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 704442 + ... + 917068.

It is an arithmetic number, because the mean of its divisors is an integer number (14105528892).

Almost surely, 2^172388403385 is an apocalyptic number.

It is an amenable number.

172388403385 is a deficient number, since it is larger than the sum of its proper divisors (53300058887).

172388403385 is a wasteful number, since it uses less digits than its factorization.

172388403385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227384.

The product of its (nonzero) digits is 3870720, while the sum is 52.

The spelling of 172388403385 in words is "one hundred seventy-two billion, three hundred eighty-eight million, four hundred three thousand, three hundred eighty-five".