185490057 has 4 divisors (see below), whose sum is σ = 247320080. Its totient is φ = 123660036.

The previous prime is 185490047. The next prime is 185490091. The reversal of 185490057 is 750094581.

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 185490057 - 2¹⁰ = 185489033 is a prime.

It is a super-2 number, since 2×185490057² = 68813122491726498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 185489997 and 185490024.

It is not an unprimeable number, because it can be changed into a prime (185490037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30915007 + ... + 30915012.

It is an arithmetic number, because the mean of its divisors is an integer number (61830020).

Almost surely, 2^185490057 is an apocalyptic number.

It is an amenable number.

185490057 is a deficient number, since it is larger than the sum of its proper divisors (61830023).

185490057 is an equidigital number, since it uses as much as digits as its factorization.

185490057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61830022.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 185490057 is about 13619.4734479715. The cubic root of 185490057 is about 570.3046048127.

The spelling of 185490057 in words is "one hundred eighty-five million, four hundred ninety thousand, fifty-seven".