73172139 has 8 divisors (see below), whose sum is σ = 97605120. Its totient is φ = 48760296.

The previous prime is 73172137. The next prime is 73172153. The reversal of 73172139 is 93127137.

It is a happy number.

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

It is not a de Polignac number, because 73172139 - 2¹ = 73172137 is a prime.

It is a super-4 number, since 4×73172139⁴ (a number of 33 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (73172137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6642 + ... + 13800.

It is an arithmetic number, because the mean of its divisors is an integer number (12200640).

Almost surely, 2^73172139 is an apocalyptic number.

73172139 is a deficient number, since it is larger than the sum of its proper divisors (24432981).

73172139 is a wasteful number, since it uses less digits than its factorization.

73172139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10569.

The product of its digits is 7938, while the sum is 33.

The square root of 73172139 is about 8554.0714867249. The cubic root of 73172139 is about 418.2621673657.

The spelling of 73172139 in words is "seventy-three million, one hundred seventy-two thousand, one hundred thirty-nine".