187809340 has 12 divisors (see below), whose sum is σ = 394399656. Its totient is φ = 75123728.

The previous prime is 187809317. The next prime is 187809341. The reversal of 187809340 is 43908781.

It is a junction number, because it is equal to n+sod(n) for n = 187809293 and 187809302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187809341) 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, 4695214 + ... + 4695253.

It is an arithmetic number, because the mean of its divisors is an integer number (32866638).

Almost surely, 2^187809340 is an apocalyptic number.

187809340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

187809340 is an abundant number, since it is smaller than the sum of its proper divisors (206590316).

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

187809340 is a wasteful number, since it uses less digits than its factorization.

187809340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9390476 (or 9390474 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 187809340 is about 13704.3547823311. The cubic root of 187809340 is about 572.6717091397.

The spelling of 187809340 in words is "one hundred eighty-seven million, eight hundred nine thousand, three hundred forty".