180821340 has 72 divisors (see below), whose sum is σ = 626851680. Its totient is φ = 41330304.

The previous prime is 180821339. The next prime is 180821387. The reversal of 180821340 is 43128081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70495 + ... + 73014.

Almost surely, 2^180821340 is an apocalyptic number.

180821340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

180821340 is an abundant number, since it is smaller than the sum of its proper divisors (446030340).

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

180821340 is a wasteful number, since it uses less digits than its factorization.

180821340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143531 (or 143526 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 180821340 is about 13446.9825611548. The cubic root of 180821340 is about 565.4791038910.

The spelling of 180821340 in words is "one hundred eighty million, eight hundred twenty-one thousand, three hundred forty".