185680381 has 4 divisors (see below), whose sum is σ = 186753852. Its totient is φ = 184606912.

The previous prime is 185680361. The next prime is 185680387. The reversal of 185680381 is 183086581.

185680381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 181333156 + 4347225 = 13466^2 + 2085^2 .

It is a cyclic number.

It is not a de Polignac number, because 185680381 - 2¹³ = 185672189 is a prime.

It is a super-2 number, since 2×185680381² = 68954407776610322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (185680387) 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, 536476 + ... + 536821.

It is an arithmetic number, because the mean of its divisors is an integer number (46688463).

Almost surely, 2^185680381 is an apocalyptic number.

It is an amenable number.

185680381 is a deficient number, since it is larger than the sum of its proper divisors (1073471).

185680381 is a wasteful number, since it uses less digits than its factorization.

185680381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073470.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 185680381 is about 13626.4588576783. The cubic root of 185680381 is about 570.4995937926.

The spelling of 185680381 in words is "one hundred eighty-five million, six hundred eighty thousand, three hundred eighty-one".