2151240 has 128 divisors (see below), whose sum is σ = 7983360. Its totient is φ = 451584.

The previous prime is 2151221. The next prime is 2151241. The reversal of 2151240 is 421512.

2151240 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2151241) 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, 10822 + ... + 11018.

It is an arithmetic number, because the mean of its divisors is an integer number (62370).

2^2151240 is an apocalyptic number.

2151240 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 2151240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3991680).

2151240 is an abundant number, since it is smaller than the sum of its proper divisors (5832120).

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

2151240 is a wasteful number, since it uses less digits than its factorization.

2151240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 2151240 is about 1466.7106054024. The cubic root of 2151240 is about 129.0910960425.

Adding to 2151240 its reverse (421512), we get a palindrome (2572752).

The spelling of 2151240 in words is "two million, one hundred fifty-one thousand, two hundred forty".