2145420 has 96 divisors (see below), whose sum is σ = 6955200. Its totient is φ = 548352.

The previous prime is 2145401. The next prime is 2145421. The reversal of 2145420 is 245412.

2145420 = T₁₀₄ + T₁₀₅ + ... + T₂₄₀.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 2145393 and 2145402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145421) 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, 15592 + ... + 15728.

It is an arithmetic number, because the mean of its divisors is an integer number (72450).

2^2145420 is an apocalyptic number.

2145420 is a gapful number since it is divisible by the number (20) 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 2145420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3477600).

2145420 is an abundant number, since it is smaller than the sum of its proper divisors (4809780).

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

2145420 is a wasteful number, since it uses less digits than its factorization.

2145420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 2145420 is about 1464.7252302053. The cubic root of 2145420 is about 128.9745758441.

The spelling of 2145420 in words is "two million, one hundred forty-five thousand, four hundred twenty".