172405137 has 8 divisors (see below), whose sum is σ = 233304736. Its totient is φ = 113221152.

The previous prime is 172405061. The next prime is 172405147. The reversal of 172405137 is 731504271.

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

It is not a de Polignac number, because 172405137 - 2¹⁴ = 172388753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172405147) 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, 428668 + ... + 429069.

It is an arithmetic number, because the mean of its divisors is an integer number (29163092).

Almost surely, 2^172405137 is an apocalyptic number.

It is an amenable number.

172405137 is a deficient number, since it is larger than the sum of its proper divisors (60899599).

172405137 is an equidigital number, since it uses as much as digits as its factorization.

172405137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857807.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 172405137 is about 13130.3136672358. The cubic root of 172405137 is about 556.5660791317.

The spelling of 172405137 in words is "one hundred seventy-two million, four hundred five thousand, one hundred thirty-seven".