1861322238 has 12 divisors (see below), whose sum is σ = 4032864888. Its totient is φ = 620440740.

The previous prime is 1861322191. The next prime is 1861322269. The reversal of 1861322238 is 8322231681.

1861322238 is a `hidden beast` number, since 1 + 8 + 613 + 2 + 2 + 2 + 38 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51703378 + ... + 51703413.

It is an arithmetic number, because the mean of its divisors is an integer number (336072074).

Almost surely, 2^1861322238 is an apocalyptic number.

1861322238 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1861322238 is an abundant number, since it is smaller than the sum of its proper divisors (2171542650).

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

1861322238 is a wasteful number, since it uses less digits than its factorization.

1861322238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103406799 (or 103406796 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 1861322238 is about 43143.0439120839. The cubic root of 1861322238 is about 1230.1002932298.

The spelling of 1861322238 in words is "one billion, eight hundred sixty-one million, three hundred twenty-two thousand, two hundred thirty-eight".