1861244336 has 40 divisors (see below), whose sum is σ = 4217182464. Its totient is φ = 779123520.

The previous prime is 1861244311. The next prime is 1861244347. The reversal of 1861244336 is 6334421681.

It is a happy number.

It is a super-3 number, since 3×1861244336³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1861244336.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188420 + ... + 198051.

Almost surely, 2^1861244336 is an apocalyptic number.

1861244336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1861244336 is an abundant number, since it is smaller than the sum of its proper divisors (2355938128).

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

1861244336 is a wasteful number, since it uses less digits than its factorization.

1861244336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386529 (or 386523 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 1861244336 is about 43142.1410687972. The cubic root of 1861244336 is about 1230.0831318435.

The spelling of 1861244336 in words is "one billion, eight hundred sixty-one million, two hundred forty-four thousand, three hundred thirty-six".