2158836 has 12 divisors (see below), whose sum is σ = 5037312. Its totient is φ = 719608.

The previous prime is 2158831. The next prime is 2158841. The reversal of 2158836 is 6388512.

2158836 = T₂₀₈ + T₂₀₉ + ... + T₂₇₉.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2158831) and next prime (2158841).

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 2158797 and 2158806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89940 + ... + 89963.

It is an arithmetic number, because the mean of its divisors is an integer number (419776).

2^2158836 is an apocalyptic number.

It is an amenable number.

2158836 is an abundant number, since it is smaller than the sum of its proper divisors (2878476).

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

2158836 is a wasteful number, since it uses less digits than its factorization.

2158836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179910 (or 179908 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 2158836 is about 1469.2977914637. The cubic root of 2158836 is about 129.2428572113.

The spelling of 2158836 in words is "two million, one hundred fifty-eight thousand, eight hundred thirty-six".