2861838 has 64 divisors (see below), whose sum is σ = 7441920. Its totient is φ = 798336.

The previous prime is 2861809. The next prime is 2861849. The reversal of 2861838 is 8381682.

2861838 is a `hidden beast` number, since 2 + 8 + 618 + 38 = 666.

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

Its product of digits (18432) is a multiple of the sum of its prime divisors (192).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25270 + ... + 25382.

It is an arithmetic number, because the mean of its divisors is an integer number (116280).

2^2861838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2861838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3720960).

2861838 is an abundant number, since it is smaller than the sum of its proper divisors (4580082).

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

2861838 is a wasteful number, since it uses less digits than its factorization.

2861838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 192 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 2861838 is about 1691.6967813411. The cubic root of 2861838 is about 141.9760258409.

The spelling of 2861838 in words is "two million, eight hundred sixty-one thousand, eight hundred thirty-eight".