2001240 has 128 divisors (see below), whose sum is σ = 7128000. Its totient is φ = 497664.

The previous prime is 2001229. The next prime is 2001247. The reversal of 2001240 is 421002.

2001240 = T₁₁ + T₁₂ + ... + T₂₂₈.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001247) 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, 18306 + ... + 18414.

2^2001240 is an apocalyptic number.

2001240 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 2001240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3564000).

2001240 is an abundant number, since it is smaller than the sum of its proper divisors (5126760).

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

2001240 is a wasteful number, since it uses less digits than its factorization.

2001240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 2001240 is about 1414.6519006455. The cubic root of 2001240 is about 126.0181379784.

Adding to 2001240 its reverse (421002), we get a palindrome (2422242).

The spelling of 2001240 in words is "two million, one thousand, two hundred forty".