172400629 has 4 divisors (see below), whose sum is σ = 172428076. Its totient is φ = 172373184.

The previous prime is 172400609. The next prime is 172400651. The reversal of 172400629 is 926004271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 926004271 = 1699 ⋅545029.

It can be written as a sum of positive squares in 2 ways, for example, as 156200004 + 16200625 = 12498^2 + 4025^2 .

It is a cyclic number.

It is not a de Polignac number, because 172400629 - 2⁹ = 172400117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172400629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172400609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 877 + ... + 18589.

It is an arithmetic number, because the mean of its divisors is an integer number (43107019).

Almost surely, 2^172400629 is an apocalyptic number.

It is an amenable number.

172400629 is a deficient number, since it is larger than the sum of its proper divisors (27447).

172400629 is an equidigital number, since it uses as much as digits as its factorization.

172400629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27446.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 172400629 is about 13130.1420022786. The cubic root of 172400629 is about 556.5612281128.

The spelling of 172400629 in words is "one hundred seventy-two million, four hundred thousand, six hundred twenty-nine".