2145808 has 80 divisors (see below), whose sum is σ = 5356800. Its totient is φ = 827904.

The previous prime is 2145779. The next prime is 2145821. The reversal of 2145808 is 8085412.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93285 + ... + 93307.

It is an arithmetic number, because the mean of its divisors is an integer number (66960).

2^2145808 is an apocalyptic number.

2145808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2145808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2678400).

2145808 is an abundant number, since it is smaller than the sum of its proper divisors (3210992).

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

2145808 is a wasteful number, since it uses less digits than its factorization.

2145808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 2145808 is about 1464.8576722672. The cubic root of 2145808 is about 128.9823504087.

2145808 divided by its sum of digits (28) gives a triangular number (76636 = T₃₉₁).

The spelling of 2145808 in words is "two million, one hundred forty-five thousand, eight hundred eight".