1861899834 has 16 divisors (see below), whose sum is σ = 3725614080. Its totient is φ = 620330880.

The previous prime is 1861899797. The next prime is 1861899839. The reversal of 1861899834 is 4389981681.

It is not an unprimeable number, because it can be changed into a prime (1861899839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62074 + ... + 87045.

It is an arithmetic number, because the mean of its divisors is an integer number (232850880).

Almost surely, 2^1861899834 is an apocalyptic number.

1861899834 is an abundant number, since it is smaller than the sum of its proper divisors (1863714246).

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

1861899834 is a wasteful number, since it uses less digits than its factorization.

1861899834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151205.

The product of its digits is 2985984, while the sum is 57.

The square root of 1861899834 is about 43149.7373572540. The cubic root of 1861899834 is about 1230.2275195485.

The spelling of 1861899834 in words is "one billion, eight hundred sixty-one million, eight hundred ninety-nine thousand, eight hundred thirty-four".