387440173 has 8 divisors (see below), whose sum is σ = 391945400. Its totient is φ = 382952448.

The previous prime is 387440171. The next prime is 387440189. The reversal of 387440173 is 371044783.

387440173 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in 4 ways, for example, as 59049 + 387381124 = 243^2 + 19682^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(387440173) divides (387440173-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 387440173 - 2¹ = 387440171 is a prime.

It is the 19684-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387440171) by changing a digit.

It is a nontrivial repunit in base 19683.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43093 + ... + 51301.

It is an arithmetic number, because the mean of its divisors is an integer number (48993175).

Almost surely, 2^387440173 is an apocalyptic number.

It is an amenable number.

387440173 is a deficient number, since it is larger than the sum of its proper divisors (4505227).

387440173 is a wasteful number, since it uses less digits than its factorization.

387440173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8751.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 387440173 is about 19683.5000190515. The cubic root of 387440173 is about 729.0123460971.

The spelling of 387440173 in words is "three hundred eighty-seven million, four hundred forty thousand, one hundred seventy-three".