172438387 has 4 divisors (see below), whose sum is σ = 188114616. Its totient is φ = 156762160.

The previous prime is 172438367. The next prime is 172438391. The reversal of 172438387 is 783834271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172438387 - 2¹¹ = 172436339 is a prime.

It is a super-2 number, since 2×172438387² = 59469994622323538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172438307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7838098 + ... + 7838119.

It is an arithmetic number, because the mean of its divisors is an integer number (47028654).

Almost surely, 2^172438387 is an apocalyptic number.

172438387 is a deficient number, since it is larger than the sum of its proper divisors (15676229).

172438387 is a wasteful number, since it uses less digits than its factorization.

172438387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15676228.

The product of its digits is 225792, while the sum is 43.

The square root of 172438387 is about 13131.5797602573. The cubic root of 172438387 is about 556.6018565509.

The spelling of 172438387 in words is "one hundred seventy-two million, four hundred thirty-eight thousand, three hundred eighty-seven".