172040429 has 4 divisors (see below), whose sum is σ = 187680480. Its totient is φ = 156400380.

The previous prime is 172040419. The next prime is 172040431. The reversal of 172040429 is 924040271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172040429 - 2⁴ = 172040413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172040419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7820009 + ... + 7820030.

It is an arithmetic number, because the mean of its divisors is an integer number (46920120).

Almost surely, 2^172040429 is an apocalyptic number.

It is an amenable number.

172040429 is a deficient number, since it is larger than the sum of its proper divisors (15640051).

172040429 is a wasteful number, since it uses less digits than its factorization.

172040429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15640050.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 172040429 is about 13116.4182992157. The cubic root of 172040429 is about 556.1733464377.

The spelling of 172040429 in words is "one hundred seventy-two million, forty thousand, four hundred twenty-nine".