1861199452 has 54 divisors (see below), whose sum is σ = 3861030264. Its totient is φ = 768990960.

The previous prime is 1861199447. The next prime is 1861199507. The reversal of 1861199452 is 2549911681.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7076673 + ... + 7076935.

Almost surely, 2^1861199452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1861199452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1930515132).

1861199452 is an abundant number, since it is smaller than the sum of its proper divisors (1999830812).

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

1861199452 is an equidigital number, since it uses as much as digits as its factorization.

1861199452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599 (or 303 counting only the distinct ones).

The product of its digits is 155520, while the sum is 46.

The square root of 1861199452 is about 43141.6208782192. The cubic root of 1861199452 is about 1230.0732439253.

The spelling of 1861199452 in words is "one billion, eight hundred sixty-one million, one hundred ninety-nine thousand, four hundred fifty-two".