186990420 has 24 divisors (see below), whose sum is σ = 523573344. Its totient is φ = 49864096.

The previous prime is 186990409. The next prime is 186990431. The reversal of 186990420 is 24099681.

It is an interprime number because it is at equal distance from previous prime (186990409) and next prime (186990431).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1558194 + ... + 1558313.

It is an arithmetic number, because the mean of its divisors is an integer number (21815556).

Almost surely, 2^186990420 is an apocalyptic number.

186990420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

186990420 is an abundant number, since it is smaller than the sum of its proper divisors (336582924).

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

186990420 is a wasteful number, since it uses less digits than its factorization.

186990420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3116519 (or 3116517 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 186990420 is about 13674.4440471999. Note that the first 3 decimals coincide. The cubic root of 186990420 is about 571.8381410745.

The spelling of 186990420 in words is "one hundred eighty-six million, nine hundred ninety thousand, four hundred twenty".