2180840356 has 6 divisors (see below), whose sum is σ = 3816470630. Its totient is φ = 1090420176.

The previous prime is 2180840329. The next prime is 2180840369. The reversal of 2180840356 is 6530480812.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2058073956 + 122766400 = 45366^2 + 11080^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272605041 + ... + 272605048.

Almost surely, 2^2180840356 is an apocalyptic number.

It is an amenable number.

2180840356 is a deficient number, since it is larger than the sum of its proper divisors (1635630274).

2180840356 is a wasteful number, since it uses less digits than its factorization.

2180840356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545210093 (or 545210091 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 2180840356 is about 46699.4684766326. The cubic root of 2180840356 is about 1296.8048468452.

The spelling of 2180840356 in words is "two billion, one hundred eighty million, eight hundred forty thousand, three hundred fifty-six".