2172929 has 4 divisors (see below), whose sum is σ = 2370480. Its totient is φ = 1975380.

The previous prime is 2172917. The next prime is 2172943. The reversal of 2172929 is 9292712.

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 2172929 - 2⁸ = 2172673 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2172895 and 2172904.

It is not an unprimeable number, because it can be changed into a prime (2172949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98759 + ... + 98780.

It is an arithmetic number, because the mean of its divisors is an integer number (592620).

It is a Proth number, since it is equal to 1061 ⋅ 2¹¹ + 1 and 1061 < 2¹¹.

2^2172929 is an apocalyptic number.

It is an amenable number.

2172929 is a deficient number, since it is larger than the sum of its proper divisors (197551).

2172929 is a wasteful number, since it uses less digits than its factorization.

2172929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197550.

The product of its digits is 4536, while the sum is 32.

The square root of 2172929 is about 1474.0858183973. The cubic root of 2172929 is about 129.5234822729.

The spelling of 2172929 in words is "two million, one hundred seventy-two thousand, nine hundred twenty-nine".