2154870 has 64 divisors (see below), whose sum is σ = 6013440. Its totient is φ = 548064.

The previous prime is 2154853. The next prime is 2154871. The reversal of 2154870 is 784512.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6037 + ... + 6383.

It is an arithmetic number, because the mean of its divisors is an integer number (93960).

2^2154870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2154870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3006720).

2154870 is an abundant number, since it is smaller than the sum of its proper divisors (3858570).

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

2154870 is a wasteful number, since it uses less digits than its factorization.

2154870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 2154870 is about 1467.9475467468. The cubic root of 2154870 is about 129.1636646314.

The spelling of 2154870 in words is "two million, one hundred fifty-four thousand, eight hundred seventy".