393171087 has 16 divisors (see below), whose sum is σ = 556168032. Its totient is φ = 246205440.

The previous prime is 393171073. The next prime is 393171089. The reversal of 393171087 is 780171393.

It is a happy number.

It is not a de Polignac number, because 393171087 - 2⁷ = 393170959 is a prime.

It is a super-3 number, since 3×393171087³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393171089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19173 + ... + 33969.

It is an arithmetic number, because the mean of its divisors is an integer number (34760502).

Almost surely, 2^393171087 is an apocalyptic number.

393171087 is a deficient number, since it is larger than the sum of its proper divisors (162996945).

393171087 is a wasteful number, since it uses less digits than its factorization.

393171087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15338.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 393171087 is about 19828.5422308348. The cubic root of 393171087 is about 732.5892210781.

It can be divided in two parts, 39317 and 1087, that added together give a palindrome (40404).

The spelling of 393171087 in words is "three hundred ninety-three million, one hundred seventy-one thousand, eighty-seven".