1861043722 has 4 divisors (see below), whose sum is σ = 2791565586. Its totient is φ = 930521860.

The previous prime is 1861043713. The next prime is 1861043729. The reversal of 1861043722 is 2273401681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2273401681 = 46507 ⋅48883.

It can be written as a sum of positive squares in only one way, i.e., 1493899801 + 367143921 = 38651^2 + 19161^2 .

It is a super-2 number, since 2×1861043722² = 6926967470391226568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1861043729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 465260929 + ... + 465260932.

Almost surely, 2^1861043722 is an apocalyptic number.

1861043722 is a deficient number, since it is larger than the sum of its proper divisors (930521864).

1861043722 is an equidigital number, since it uses as much as digits as its factorization.

1861043722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930521863.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 1861043722 is about 43139.8159708639. The cubic root of 1861043722 is about 1230.0389354674.

The spelling of 1861043722 in words is "one billion, eight hundred sixty-one million, forty-three thousand, seven hundred twenty-two".