2145940 has 24 divisors (see below), whose sum is σ = 4618152. Its totient is φ = 837120.

The previous prime is 2145937. The next prime is 2145953. The reversal of 2145940 is 495412.

It can be written as a sum of positive squares in 4 ways, for example, as 258064 + 1887876 = 508^2 + 1374^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489 + ... + 2128.

It is an arithmetic number, because the mean of its divisors is an integer number (192423).

2^2145940 is an apocalyptic number.

2145940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145940 is an abundant number, since it is smaller than the sum of its proper divisors (2472212).

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

2145940 is a wasteful number, since it uses less digits than its factorization.

2145940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2667 (or 2665 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2145940 is about 1464.9027271461. The cubic root of 2145940 is about 128.9849951500.

The spelling of 2145940 in words is "two million, one hundred forty-five thousand, nine hundred forty".