2151456 has 48 divisors (see below), whose sum is σ = 5743584. Its totient is φ = 705024.

The previous prime is 2151451. The next prime is 2151463. The reversal of 2151456 is 6541512.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (2151451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6855 + ... + 7161.

It is an arithmetic number, because the mean of its divisors is an integer number (119658).

2^2151456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2871792).

2151456 is an abundant number, since it is smaller than the sum of its proper divisors (3592128).

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

2151456 is a wasteful number, since it uses less digits than its factorization.

2151456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 385 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 2151456 is about 1466.7842377119. The cubic root of 2151456 is about 129.0954164567.

Adding to 2151456 its reverse (6541512), we get a palindrome (8692968).

The spelling of 2151456 in words is "two million, one hundred fifty-one thousand, four hundred fifty-six".