186420381 has 32 divisors (see below), whose sum is σ = 309350400. Its totient is φ = 97433280.

The previous prime is 186420361. The next prime is 186420383. The reversal of 186420381 is 183024681.

186420381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 186420381 - 2⁹ = 186419869 is a prime.

It is a super-2 number, since 2×186420381² = 69505116904370322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (186420383) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3516 + ... + 19626.

It is an arithmetic number, because the mean of its divisors is an integer number (9667200).

Almost surely, 2^186420381 is an apocalyptic number.

It is an amenable number.

186420381 is a deficient number, since it is larger than the sum of its proper divisors (122930019).

186420381 is a wasteful number, since it uses less digits than its factorization.

186420381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16169.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 186420381 is about 13653.5849138605. The cubic root of 186420381 is about 571.2564680608.

The spelling of 186420381 in words is "one hundred eighty-six million, four hundred twenty thousand, three hundred eighty-one".