17972129 has 4 divisors (see below), whose sum is σ = 20539584. Its totient is φ = 15404676.

The previous prime is 17972117. The next prime is 17972153. The reversal of 17972129 is 92127971.

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 not a de Polignac number, because 17972129 - 2¹² = 17968033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17972092 and 17972101.

It is not an unprimeable number, because it can be changed into a prime (17972329) 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, 1283717 + ... + 1283730.

It is an arithmetic number, because the mean of its divisors is an integer number (5134896).

Almost surely, 2^17972129 is an apocalyptic number.

It is an amenable number.

17972129 is a deficient number, since it is larger than the sum of its proper divisors (2567455).

17972129 is an equidigital number, since it uses as much as digits as its factorization.

17972129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567454.

The product of its digits is 15876, while the sum is 38.

The square root of 17972129 is about 4239.3547858135. The cubic root of 17972129 is about 261.9388053184.

The spelling of 17972129 in words is "seventeen million, nine hundred seventy-two thousand, one hundred twenty-nine".