188681340 has 24 divisors (see below), whose sum is σ = 528307920. Its totient is φ = 50315008.

The previous prime is 188681321. The next prime is 188681347. The reversal of 188681340 is 43186881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188681347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1572285 + ... + 1572404.

It is an arithmetic number, because the mean of its divisors is an integer number (22012830).

Almost surely, 2^188681340 is an apocalyptic number.

188681340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188681340 is an abundant number, since it is smaller than the sum of its proper divisors (339626580).

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

188681340 is a wasteful number, since it uses less digits than its factorization.

188681340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144701 (or 3144699 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 188681340 is about 13736.1326435063. The cubic root of 188681340 is about 573.5566471283.

It can be divided in two parts, 188 and 681340, that added together give a triangular number (681528 = T₁₁₆₇).

The spelling of 188681340 in words is "one hundred eighty-eight million, six hundred eighty-one thousand, three hundred forty".