2151786 has 48 divisors (see below), whose sum is σ = 5400864. Its totient is φ = 566496.

The previous prime is 2151781. The next prime is 2151791. The reversal of 2151786 is 6871512.

It is an interprime number because it is at equal distance from previous prime (2151781) and next prime (2151791).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2151781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3541 + ... + 4103.

It is an arithmetic number, because the mean of its divisors is an integer number (112518).

2^2151786 is an apocalyptic number.

2151786 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2700432).

2151786 is an abundant number, since it is smaller than the sum of its proper divisors (3249078).

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

2151786 is a wasteful number, since it uses less digits than its factorization.

2151786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595 (or 588 counting only the distinct ones).

The product of its digits is 3360, while the sum is 30.

The square root of 2151786 is about 1466.8967243811. The cubic root of 2151786 is about 129.1020165312.

The spelling of 2151786 in words is "two million, one hundred fifty-one thousand, seven hundred eighty-six".