186990820 has 48 divisors (see below), whose sum is σ = 417030768. Its totient is φ = 70184960.

The previous prime is 186990787. The next prime is 186990823. The reversal of 186990820 is 28099681.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 12544 + 186978276 = 112^2 + 13674^2 .

It is not an unprimeable number, because it can be changed into a prime (186990823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156144 + ... + 157336.

It is an arithmetic number, because the mean of its divisors is an integer number (8688141).

Almost surely, 2^186990820 is an apocalyptic number.

186990820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 186990820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208515384).

186990820 is an abundant number, since it is smaller than the sum of its proper divisors (230039948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

186990820 is a wasteful number, since it uses less digits than its factorization.

186990820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680 (or 1678 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 186990820 is about 13674.4586730152. The cubic root of 186990820 is about 571.8385488228.

The spelling of 186990820 in words is "one hundred eighty-six million, nine hundred ninety thousand, eight hundred twenty".