173420638 has 32 divisors (see below), whose sum is σ = 299959200. Its totient is φ = 74640384.

The previous prime is 173420629. The next prime is 173420641. The reversal of 173420638 is 836024371.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14106 + ... + 23362.

It is an arithmetic number, because the mean of its divisors is an integer number (9373725).

Almost surely, 2^173420638 is an apocalyptic number.

173420638 is a deficient number, since it is larger than the sum of its proper divisors (126538562).

173420638 is a wasteful number, since it uses less digits than its factorization.

173420638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9324.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 173420638 is about 13168.9269874200. The cubic root of 173420638 is about 557.6567027172.

The spelling of 173420638 in words is "one hundred seventy-three million, four hundred twenty thousand, six hundred thirty-eight".