1861140544 has 28 divisors (see below), whose sum is σ = 3707603964. Its totient is φ = 926941184.

The previous prime is 1861140517. The next prime is 1861140557. The reversal of 1861140544 is 4450411681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1298881600 + 562258944 = 36040^2 + 23712^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40129 + ... + 73024.

Almost surely, 2^1861140544 is an apocalyptic number.

It is an amenable number.

1861140544 is a deficient number, since it is larger than the sum of its proper divisors (1846463420).

1861140544 is a wasteful number, since it uses less digits than its factorization.

1861140544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113422 (or 113412 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 1861140544 is about 43140.9381446440. The cubic root of 1861140544 is about 1230.0602662872.

The spelling of 1861140544 in words is "one billion, eight hundred sixty-one million, one hundred forty thousand, five hundred forty-four".