185420129 has 4 divisors (see below), whose sum is σ = 188918676. Its totient is φ = 181921584.

The previous prime is 185420117. The next prime is 185420141. The reversal of 185420129 is 921024581.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (185420117) and next prime (185420141).

It can be written as a sum of positive squares in 2 ways, for example, as 45589504 + 139830625 = 6752^2 + 11825^2 .

It is a cyclic number.

It is not a de Polignac number, because 185420129 - 2¹⁶ = 185354593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 185420095 and 185420104.

It is not an unprimeable number, because it can be changed into a prime (185420629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1749194 + ... + 1749299.

It is an arithmetic number, because the mean of its divisors is an integer number (47229669).

Almost surely, 2^185420129 is an apocalyptic number.

It is an amenable number.

185420129 is a deficient number, since it is larger than the sum of its proper divisors (3498547).

185420129 is an equidigital number, since it uses as much as digits as its factorization.

185420129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498546.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 185420129 is about 13616.9059995287. The cubic root of 185420129 is about 570.2329293213.

The spelling of 185420129 in words is "one hundred eighty-five million, four hundred twenty thousand, one hundred twenty-nine".